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The waste of resources associated with fruit decay is rapidly spreading globally, threatening the interests of relevant practitioners and the health of consumer groups, and demanding precise solutions. Controlling fruit ripening through ethylene regulation is one of the most important strategies for providing high‐quality fruits. However, current materials for ethylene regulation still have difficulty realizing their application potential due to high manufacturing costs and performance deficiencies. In this review, the ethylene‐controlled release materials for ripening based on molecular encapsulation and the ethylene scavengers for preservation based on mechanisms such as oxidation, photodegradation, and adsorption are presented. We discuss and analyze a wide range of materials in terms of mechanism, performance, potential of applicability, and sustainability. The ethylene release behavior of encapsulating materials depends on the form in which the ethylene binds to the material as well as on environmental factors (humidity and temperature). For ethylene scavengers, there are a variety of scavenging mechanisms, but they generally require porous materials as adsorption carriers. We highlight the great opportunity of designing soft crystalline porous materials as efficient ethylene adsorbent due to their unique structural properties. We present this review, including a summary of practical characteristics and deficiencies of various materials, to establish a systematic understanding of fruit quality assurance materials applied to ethylene regulation, anticipating a promising prospect for these new materials. [ABSTRACT FROM AUTHOR]

Post‐modification of porous materials with molecular modulators has emerged as a well‐established strategy for improving gas adsorption and separation. However, a notable challenge lies in maintaining porosity and the limited applicability of the current method. In this study, we employed the mechanochemical “Cage‐on‐MOF” strategy, utilizing porous coordination cages (PCCs) with intrinsic pores and apertures as surface modulators to improve the gas adsorption and separation properties of the parent MOFs. We demonstrated the fast and facile preparation of 28 distinct MOF@PCC composites by combining 7 MOFs with 4 PCCs with varying aperture sizes and exposed functional groups through a mechanochemical reaction in 5 mins. Only the combinations of PCCs and MOFs with closely matched aperture sizes exhibited enhanced gas adsorption and separation performance. Specifically, MOF‐808@PCC‐4 exhibited a significantly increased C2H2 uptake (+64 %) and a longer CO2/C2H2 separation retention time (+40 %). MIL‐101@PCC‐4 achieved a substantial C2H2 adsorption capacity of 6.11 mmol/g. This work not only highlights the broad applicability of the mechanochemical “Cage‐on‐MOF” strategy for the functionalization of a wide range of MOFs but also establishes potential design principles for the development of hybrid porous materials with enhanced gas adsorption and separation capabilities, along with promising applications in catalysis and intracellular delivery. [ABSTRACT FROM AUTHOR]

An alternative synthesis route to obtain ultramicroporous zeolitic imidazolate framework‐8 (ZIF‐8) is reported that is rapid and does not require organic solvent or heating. The polyethylene glycol‐templated ZIF‐8 nanoparticles (<50 nm size) exhibited a high BET (Brunauer, Emmett and Teller) surface area of 1853 m2/g, a total pore volume of 0.73 cm3/g, and 0.54 nm ultramicropores. A new approach is introduced here to better understand gas adsorption in porous metal organic frameworks (MOFs) that combines theoretical and experimental isotherm data obtained for five gases with statistical physics modelling. The multiscale analytical model reveals that the gas molecules, irrespective of their structure, adsorb in a mixed orientation at low temperature, and a parallel multi‐molecular orientation at higher temperature. The number of gas molecules adsorbed per site ranged from 0.83–2.2 while the number of adsorbent layers ranged between 1.4–5.6, depending on the gas and the temperature. The multilayer adsorption processes involved adsorption energies from 2.85 kJ/mol–9.77 kJ/mol for all gases, consistent with physisorption via van der Waals and London dispersion forces. The initial adsorption energies were higher and therefore stronger. A particularly high capacity for CO2 of 1088 mg(CO2)/g at 298 K was observed while H2 adsorption was only 9 mg(H2)/g. The other gases adsorbed at 145 mg/g–245 mg/g at 298 K. Thermodynamic functions that governed the adsorption process such as the internal energy, the enthalpy, and Gibbs free energy, are also reported, as well as the adsorption entropies, for the 5 gases. [ABSTRACT FROM AUTHOR]

Catalytic transformation of CO2 into value‐added chemical products can provide an appropriate solution for the raising environmental issues. To date, various metal‐organic frameworks (MOFs) with transition metal ions have been explored for CO2 capture and conversion, but alkaline earth metal‐based MOFs are comparatively less studied. Metal ions like Sr(II) having relatively large radius give rise to a high coordination number resulting in higher stability of the MOFs. Moreover, the introduction of N‐rich functional group in organic linker like −NH2, −CONH− and triazole into MOF backbone enhance their CO2 capture and conversion efficiency. Herein, the effect of amine group on the catalytic efficiency of MOFs for CO2 cycloaddition with epoxides under solvent free and ambient conditions are presented. The di‐carboxylates, such as 5‐aminoisophthalate (AmIP) and 5‐bromoisophthalate (BrIP) were utilized to synthesize Sr(II) based MOFs. The Zn(II) MOF was synthesized using tetra‐carboxylate containing amide spacer (OAT) and 4‐amino‐4H‐1,2,4‐triazole (AMT). All three MOFs exhibited porous networks with guest available volume ranging from 15 to 58 %. The catalytic efficiency of the MOFs towards carbon dioxide fixation reaction was explored. The catalytic performances revealed that the presence of amine group in the channels enhances the catalytic efficiency of the MOFs. [ABSTRACT FROM AUTHOR]

Graphitic nanoplatelets (GnPs), edge‐selectively carboxylated graphitic nanoplatelets (ECGnPs), are functionalized with a carboxylic acid at the edge increasing their surface area, and are highly dispersible in various solvents. However, there is a limit in that the basal plane remains intact because it is functionalized only in the part where the radical is generated at the edge. Here, we activate ECGnPs to have porous structures by flowing CO2 at 900 °C. Etching of the ECGnPs structure was performed through the Boudouard reaction, and the surface area increased from 579 m2 g−1 to a maximum of 2462 m2 g−1. In addition, the pore structure was investigated with various adsorption gases (CH4, Ar, CO2, H2, and N2) according to the reaction time. This study provides the overall green chemistry in that it utilizes CO2 from manufacturing to activation compared to the process of activating with conventional chemical treatment. [ABSTRACT FROM AUTHOR]

A type of foamed plastic insulation that improves thermal performance while maintaining the original durability by adding fillers with low radiation rates in foamed plastic insulation is investigated. The thermal conductivity of extruded polystyrene foam (XPS) adding graphite is reduced by 14% compared to without graphite additives. The study investigates that mechanism by comparing the properties of XPS and XPS containing graphite (graph XPS) through the gas isotherm method and 3D imaging analysis by X‐ray CT. First, the specific surface area of the insulation's resin is examined through the gas isotherm method using N2, H2O, and CO2. The results confirmed that graph XPS has a more increased specific surface area than XPS. Second, the internal structure of the insulation and its strut/pore distribution is confirmed through X‐ray CT, which showed an increase in surface area with a thinning of the strut. The improved thermal performance due to the addition of graphite may contribute to an increase in the surface area of the insulation. [ABSTRACT FROM AUTHOR]

Metal‐organic frameworks (MOFs) have emerged as versatile materials with exceptional properties, including high porosities, large surface areas, and remarkable stabilities, making them attractive for various applications. MOF‐5 stands out for its thermal stability and surface area, making it promising for diverse applications, including drug delivery and gas adsorption. This study explores the potential of amino acid MOF (AA‐MOF) composites, integrating phenylalanine, tryptophan, and tyrosine, for selective CO2 and CH4 adsorption using grand canonical Monte Carlo (GCMC) simulations. The impact of amino acid composition and spatial arrangement within MOF‐5 on selective CO2 and CH4 adsorption performance have been investigated. The results indicate that tryptophan‐MOF‐5 exhibits the highest CO2 uptake due to the interaction between CO2 and tryptophan, while phenylalanine‐MOF‐5 demonstrated the lowest affinity for gas adsorption. Radial distribution function (RDF) analysis reveals distinct gas distribution patterns within the composites, with tryptophan playing a dominant role in gas adsorption. Additionally, analysis of total energy, enthalpy of adsorption, and Henry's coefficient provide insights into the thermodynamic aspects of gas adsorption onto AA‐MOF composites. This study enhances the understanding of the fundamental mechanisms underlying CO2 and CH4 selective adsorption in amino acid MOF composites, facilitating the development of efficient gas separation technologies. [ABSTRACT FROM AUTHOR]

A novel class of crystalline porous materials has been developed utilizing multilevel dynamic linkages, including covalent B−O, dative B←N and hydrogen bonds. Typically, boronic acids undergo in situ condensation to afford B3O3‐based units, which further extend to molecular complexes or chains via B←N bonds. The obtained superstructures are subsequently interconnected via hydrogen bonds and π–π interactions, producing crystalline porous organic frameworks (CPOFs). The CPOFs display excellent solution processability, allowing dissolution and subsequent crystallization to their original structures, independent of recrystallization conditions, possibly due to the diverse bond energies of the involved interactions. Significantly, the CPOFs can be synthesized on a gram‐scale using cost‐effective monomers. In addition, the numerous acidic sites endow the CPOFs with high NH3 capacity, surpassing most porous organic materials and commercial materials. [ABSTRACT FROM AUTHOR]

Two crystalline large‐sized porous organic cages (POCs) based on conical calix[4]arene (C4A) were designed and synthesized. The four‐jaw C4A unit tends to follow the face‐directed self‐assembly law with the planar triangular building blocks such as tris(4‐aminophenyl)amine (TAPA) or 1,3,5‐tris(4‐aminophenyl)benzene (TAPB) to generate a predictable cage with a stoichiometry of [6+8]. The formation of the large cages is confirmed through their relative molecular mass measured using MALDI‐TOF/TOF spectra. The protonated molecular ion peaks of C4A‐TAPA and C4A‐TAPB were observed at m/z 5109.0 (calculated for C336H240O24N32: m/z 5109.7) and m/z 5594.2 (calculated for C384H264O24N24: m/z 5598.4). C4A‐POCs exhibit I‐type N2 adsorption‐desorption isotherms with the BET surface areas of 1444.9 m2 ⋅ g−1 and 1014.6 m2 ⋅ g−1. The CO2 uptakes at 273 K are 62.1 cm3 ⋅ g−1 and 52.4 cm3 ⋅ g−1 at a pressure of 100 KPa. The saturated iodine vapor static uptakes at 348 K are 3.9 g ⋅ g−1 and 3.5 g ⋅ g−1. The adsorption capacity of C4A‐TAPA for SO2 reaches to 124.4 cm3 ⋅ g−1 at 298 K and 1.3 bar. Additionally, the adsorption capacities of C4A‐TAPA for C2H2, C2H4, and C2H6 were evaluated. [ABSTRACT FROM AUTHOR]

A coordination network containing isolated pores without interconnecting channels is prepared from a tetrahedral ligand and copper(I) iodide. Despite the lack of accessibility, CO2 is selectively adsorbed into these pores at 298 K and then retained for more than one week while exposed to the atmosphere. The CO2 adsorption energy and diffusion mechanism throughout the network are simulated using Matlantis, which helps to rationalize the experimental results. CO2 enters the isolated voids through transient channels, termed "magic doors", which can momentarily appear within the structure. Once inside the voids, CO2 remains locked in limiting its escape. This mechanism is facilitated by the flexibility of organic ligands and the pivot motion of cluster units. In situ powder X‐ray diffraction revealed that the crystal structure change is negligible before and after CO2 capture, unlike gate‐opening coordination networks. The uncovered CO2 sorption and retention ability paves the way for the design of sorbents based on isolated voids. [ABSTRACT FROM AUTHOR]

In this report, a microporous metal–organic framework of [Ca(TDC)(DMA)]n (1) and a two‐dimensional coordination polymer of [Ca(TDC)(DMF)2]n (2), (TDC2−=Thiophene‐2,5‐dicarboxylate, DMA=N, N'‐dimethylacetamide and DMF=N, N'‐dimethylformamide) based on Ca(II) were designed by the effect of solvent, and X‐ray analysis was performed for the single crystals of 1 and 2. Then, compound 1 was synthesized in three different methods and identified with a set of analyses. Compared to other adsorbents, MOFs are widely used in the field of adsorption and separation of various gases due to a series of distinctive features such as diverse and adjustable structures pores with different dimensions, high porosity and surface area with regular distribution of active sites. Therefore, the ability of 1 to uptake single gases (CH4, CO2, C2H2, H2, and N2) and separation of several binary mixtures of gases (CO2/CH4, CO2/N2, CO2/H2 and CO2/C2H2), were investigated using Grand Canonical Monte Carlo simulations. Volumetric and gravimetric adsorption isotherms in various operating conditions, the isosteric heat of adsorption (qst), the chemical potential for each thermodynamic state, and snapshots during the simulation process were reported in all cases. The results obtained from the adsorption simulation indicate that compound 1 has a high capacity for uptake of H2 (16 mmol g−1) and N2 (12.5 mmol g−1), CO2 (6.6 mmol g−1), C2H2 (5 mmol g−1) and CH4 (1.5 mmol g−1) gases at 1 bar. It also performs well in separating CO2 in binary mixtures, which can be attributed to the presence of open metal sites in nodes of 1 and their electrostatic tendency to interact with CO2 containing the higher quadrupole dipole moment compared to other components of the mixture. [ABSTRACT FROM AUTHOR]

A series of metal–organic frameworks (MOFs) based on zinc ions and two triptycene ligands of different size have been synthesized under solvothermal conditions. Structural analyses revealed that they are isostructural 3D‐network MOFs. The high porosity and thermal stability of these MOFs can be attributed to the highly rigid triptycene‐based ligands. Their BET specific surface areas depend on the size of the triptycene ligands. In contrast to these surface‐area data, the H2 and CO2 adsorption of these MOFs is larger for MOFs with small pores. Consequently, we introduced functional groups to the bridge‐head position of the triptycene ligands and investigated their effect on the gas‐sorption properties. The results unveiled the role of the functional groups in the specific CO2 binding via an induced interaction between adsorbates and the functional groups. Excellent H2 and CO2 properties in these MOFs were achieved in the absence of open metal sites. [ABSTRACT FROM AUTHOR]

Preserving large permanent pore structures in a fluid may endow conventional liquids with emergent physical properties. However, such materials are challenging to make because of the tendency of the pores to be filled and occupied by the solvent molecules. Here, we report the design and synthesis of the first Type III porous liquid (PL) containing uniform yet stable 480 nm cavities. This was achieved by first constructing a single crystalline hollow metal–organic framework (MOF), UiO‐66‐NH2, through chemical etching. The thin yet defect‐free MOF shell effectively excludes the bulky poly(dimethylsiloxane) solvent molecules from entering the cavity through its 4 Å aperture, resulting in the preservation of both micro‐ and macroporosity in the PL. These enormous void spaces allow the PL to reversibly host and release up to 27 wt % water for up to 10 cycles. The switching between the "dry" state and the "wet" state led to a large changes of the thermal conductivity of the PL from 0.140 to 0.256 W m−1 K−1, affording a guest‐responsive liquid thermal switch with a switching ratio of 1.8. [ABSTRACT FROM AUTHOR]

Developing adsorptive separation processes based on C2H6‐selective sorbents to replace energy‐intensive cryogenic distillation is a promising alternative for C2H4 purification from C2H4/C2H6 mixtures, which however remains challenging. During our studies on two isostructural metal–organic frameworks (Ni‐MOF 1 and Ni‐MOF 2), we found that Ni‐MOF 2 exhibited significantly higher performance for C2H6/C2H4 separation than Ni‐MOF‐1, as clearly established by gas sorption isotherms and breakthrough experiments. Density‐Functional Theory (DFT) studies showed that the unblocked unique aromatic pore surfaces within Ni‐MOF 2 induce more and stronger C−H⋅⋅⋅π with C2H6 over C2H4 while the suitable pore spaces enforce its high C2H6 uptake capacity, featuring Ni‐MOF 2 as one of the best porous materials for this very important gas separation. It generates 12 L kg−1 of polymer‐grade C2H4 product from equimolar C2H6/C2H4 mixtures at ambient conditions. [ABSTRACT FROM AUTHOR]

Permanent macropores (>50 nm) had not been reported in the liquid state until a recent report by Tao Li and co‐workers describing a synthetic strategy to form a porous liquid with dual micro‐macroporosity. This is prepared by producing hierarchically porous particles that are surface coated and fluidised by dispersion. Surface micropores enable permanent porosity by steric exclusion of the fluid phase. The material has a considerable water uptake capacity (27 % w/w) due to large (480 nm) unoccupied macropores. This also enables switching of thermal conductivity on uptake of water. These are new properties translated from porous solids to the liquid state. [ABSTRACT FROM AUTHOR]

The unprecedented co‐thermolysis of decaborane(14) (nido‐B10H14) and toluene results in a novel porous material (that we have named "activated borane") containing micropores between 1.0 and 1.5 nm in diameter and a specific surface area of 774 m2 g−1 (Ar, 87 K) that is thermally stable up to 1000 °C. Solid state 1H, 11B and 13C MAS NMR, UV‐vis and IR spectroscopies suggest an amorphous structure of borane clusters interconnected by toluene moieties in a ratio of about three toluene molecules for every borane cluster. In addition, the structure contains Lewis‐acidic tri‐coordinated boron sites giving it some unique properties. Activated borane displays high sorption capacity for pollutants such as sulfamethoxazole, tramadol, diclofenac and bisphenol A that exceed the capacity of commercially‐available activated carbon. The consistency in properties for each batch made, and the ease of its synthesis, make activated borane a promising porous material worthy of broad attention. [ABSTRACT FROM AUTHOR]

Adsorption technology based on ethane‐selective materials is a promising alternative to energy‐intensive cryogenic distillation for separating ethane (C2H6) and ethylene (C2H4). We employed a pore engineering strategy to tune the pore environment of a metal–organic framework (MOF) through organic functional groups and boosted the C2H6/C2H4 separation of the MOF. Introduction of amino (−NH2) groups into Tb‐MOF‐76 not only decreased pore sizes but also facilitated multiple guest‐host interactions in confined pores. The NH2‐functionalized Tb‐MOF‐76(NH2) has increased C2H6 and C2H4 uptakes and C2H6/C2H4 selectivity. The results of experimental and simulated transient breakthroughs reveal that Tb‐MOF‐76(NH2) has significantly improved one‐step separation performance for C2H6/C2H4 mixtures with a high C2H4 (>99.95 %) productivity of 17.66 L kg−1 compared to 7.53 L kg−1 by Tb‐MOF‐76, resulting from the suitable pore confinement and accessible −NH2 groups on pore surfaces. [ABSTRACT FROM AUTHOR]

Because C2H4 plays an essential role in the chemical industry, economical and energy‐efficient separation of ethylene (C2H4) from ethane (C2H6) is extremely important. With the exception of energy‐intensive cryogenic distillation, there are few one‐step methods to obtain polymer‐grade (≥99.95 % pure) C2H4 from C2H4/C2H6 mixtures. Here we report a highly stable metal‐organic‐framework (MOF) FJI‐H11‐Me(des) (FJI‐H=Hong's group in Fujian Institute of Research on the Structure of Matter) which features one‐dimensional hexagonal nonpolar pore surfaces constructed by aromatic rings and alkyl groups. This FJI‐H11‐Me(des) adsorbs C2H6 rather than C2H4 between 273 and 303 K. Practical breakthrough experiments with C2H4 containing 1 % C2H6 have shown that FJI‐H11‐Me(des) can realize the acquisition in one‐step of polymer‐grade, 99.95 % pure C2H4 under various conditions including different gas flow rates, temperatures and relative humidity. [ABSTRACT FROM AUTHOR]

CO2 adsorption on granulated zeolite 13X by organic binders were studied by volumetric measurements. The goal of research was finding the optimum thermal conditions after shaping by organic binders to enhance the mechanical strength and adsorption capacity of granules. Previously published literature investigated the usage of traditional inorganic binders and the effect of organic binders has never been surveyed. Polyvinyl alcohol and polyethylene glycol were added to zeolite powder as organic binders and the effect of calcination temperature and calcination time on the physicochemical and mechanical properties of granules were studied. The textural/structural and morphological features of synthesized adsorbents were characterized by N2 isotherm, X‐ray diffraction (XRD), Thermogravimetric analysis (TGA), Differential thermal analysis (DTA), Scanning electron microscopy (SEM), and Energy Dispersive X‐ray spectroscopy (EDX). The results showed that using high temperatures and longer periods for the calcination had a favorable effect on their mechanical properties but their effects on the physical properties were negative. Thermodynamic investigations were employed to understand the adsorption behavior. Equilibrium adsorption demonstrated that Langmuir model was the most suitable model for description CO2 adsorption and the maximum adsorption capacity was 4.02 (mmol/g). The thermodynamic analysis indicated that the adsorption process was spontaneous and exothermic in nature. The value of isosteric heat of adsorption was analyzed based on Clausius–Clapeyron equation. [ABSTRACT FROM AUTHOR]

Porous organic salts (POSs) are porous organic materials, in which various aromatic sulfonic acids and amines are regularly self‐assembled by charge‐assisted hydrogen bonding. POSs exhibit high solubility in highly polar solvents. Therefore, they are prepared via facile recrystallization and exhibit high recyclability. In this study, tetrahedral‐structured tetrasulfonic acid and triphenylmethylamine (TPMA) were combined to construct POSs with rigid diamond networks called diamondoid porous organic salts (d‐POSs). Furthermore, by introducing substituents (e.g. F, Cl, Br, or I) at the para‐positions of benzene rings of TPMA, these substituents were exposed on the void surface of d‐POSs, and their diamond networks were distorted. This induced the formation of a variety of void structures and environments in the d‐POSs, which significantly affected their gas adsorption behavior. In particular, the d‐POS from TPMA substituted by fluorine exhibited very high CO2 adsorption of 182 mL(STP) g−1 at 1 atm in all‐organic porous materials. [ABSTRACT FROM AUTHOR]

A preconcentrator is a device used to lower the detection limit of a gas sensor, often integrated upstream of the sensor. Gas preconcentrators have attracted great research interest because of their wide range applications including atmospheric pollution detection, breath analysis, and homeland security. Nanoporous materials, such as carbonaceous adsorbents, metal‐organic frameworks, metallic adsorbents, and oxides, are used to preconcentrate gases for improving detection capability. In this review, preconcentrator materials, detection technologies, and integration with detector configurations are surveyed. Current limitations and future improvement opportunities are also discussed. [ABSTRACT FROM AUTHOR]

One‐step C2H4 purification from ternary C2H6/C2H4/C2H2 mixtures by a single adsorbent is of great industrial significance, but few adsorbents achieve this separation. Herein, we report a robust metal–organic framework (MOF) that possesses methyl‐decorated nonpolar pores and shows one‐step C2H4 purification (purity >99.9 %) from binary C2H6/C2H4 mixtures and ternary C2H6/C2H4/C2H2 mixtures. The methyl groups in pores provide a suitable pore environment to simultaneously enhance the adsorption capacity for C2H2 and C2H6 compared to C2H4. Simulations revealed the multiple interactions between C2H6 or C2H2 molecules and the pore wall, while the interactions with C2H4 molecules are weak and also unfavorable due to the repulsion from methyl groups in pores. The MOF displays high C2H6 and C2H2 uptakes and benchmark C2H6/C2H4 selectivity (2.2), surpassing all of the reported MOFs for one‐step C2H4 purification from ternary C2H6/C2H4/C2H2 mixtures. [ABSTRACT FROM AUTHOR]

The design and creation of soft porous crystals combining regularity and flexibility may promote potential applications for gas storage and separation due to their deformable framework's responsiveness to external stimuli. The flexibility of metal–organic frameworks (MOFs) relies on alterable degrees of freedom that are mainly provided by organic linkers or the junctions linking organic and inorganic building units. Herein, we report a new dynamic MOF whose flexibility originates from an unprecedented tailorable Mn8O38‐cluster and shows simultaneous coordination geometry changes and ligand migration that are reversibly driven by guest exchange. This provides an extra degree of freedom to the framework's deformation, resulting in three‐dimensional variations in the framework that subtly respond to varied aromatic molecules. The gas adsorption behavior of this flexible MOF was evaluated, and the selective separation of light hydrocarbons and Freon gases is achieved. [ABSTRACT FROM AUTHOR]

An uncommon example of stable mixed‐ligand zinc phosphite with genuine pores has been synthesized by using zinc metal, inorganic phosphite acid, thio‐functionalized O‐donor (2,5‐thiophenedicarboxylate, TPDC), and tetradentate N‐donor [1,2,4,5‐tetrakis(imidazol‐1‐ylmethyl)benzene, TIMB] units assembled into one crystalline structure according to a hydro(solvo)thermal method. This is a very rare case of a metal phosphite incorporating both N‐ and O‐donor ligands. The tetradentate TIMB linker bound to zinc atoms of the isolated zincophosphite hexamers to form a 3D open‐framework structure by crosslinking structural components of 1D chains and 2D layers. Here, the TPDC ligand acts as a monodentate binding model to functionalize its porous structure with the uncoordinated S atom and COO− group. Interestingly, this compound demonstrates the highest H2 storage capacity among organic–inorganic hybrid metal phosphates (and phosphites), and a good CO2 capture at 298 K compared with the majority of crystalline materials. The possible adsorption sites and selectivity for CO2 over H2, N2, and CO at 298 K were calculated by using density functional theory (DFT), the ideal adsorption solution theory (IAST), and fitting experimental pure‐component adsorption data. [ABSTRACT FROM AUTHOR]

Two‐dimensional materials are excellent candidates for effective gas detection due to the large surface‐volume ratio, however the controllability to adsorb/desorb the gas molecules for recycling use is still a big challenge. In this study, different from previous strategies to modulate gas adsorption behavior via strain and external electric field, a novel approach to achieve gas adsorption control via ferroelectric (FE) switching is proposed. From first principle simulations, it is found that gas molecule adsorptions on Fe and Mn doped defective graphene can be well controlled when it is placed on the surface of FE In2Se3. The adsorption energies and charge transfer can be significantly modulated when the polarization is reversed, due to the polarization dependent electron redistribution and band state shifts near the Fermi level. The hypothesis of the FE controlled gas adsorption is further supported by the adsorption variations under the electric field. These findings provide feasible approaches and design principles for the next generation gas sensors. [ABSTRACT FROM AUTHOR]

The coordinatively unsaturated chromium(II)‐based Cr3[(Cr4Cl)3(BTT)8]2 (Cr−BTT; BTT3−=1,3,5‐benzenetristetrazolate) metal–organic framework (MOF) has been shown to exhibit exceptional selectivity towards adsorption of O2 over N2/H2. Using periodic density functional theory (DFT) calculations, we attempted to decipher the origin of this puzzling selectivity. By computing and analyzing the magnetic exchange coupling, binding energies, the partial density of states (pDOS), and adsorption isotherms for the pristine and gas‐bound MOFs [(Cr4(X)4Cl)3(BTT)8]3− (X=O2, N2, and H2), we unequivocally established the role of spin states and spin coupling in controlling the gas selectivity. The computed geometries and gas adsorption isotherms are consistent with the earlier experiments. The binding of O2 to the MOF follows an electron‐transfer mechanism resulting in a CrIII superoxo species (O2.−) with a very strong antiferromagnetic coupling between the two centers, whereas N2/H2 are found to weakly interact with the metal center and hence only slightly perturb the associated coupling constants. Although the gas‐bound and unbound MOFs have an S=0 ground state (GS), the nature of spin the configurations and the associated magnetic exchanges are dramatically different. The binding energy and the number of oxygen molecules that can favorably bind to the Cr center were found to vary with respect to the spin state, with a significant energy margin (47.6 kJ mol−1). This study offers a hitherto unknown strategy of using spin state/spin couplings to control gas adsorption selectivity in MOFs. [ABSTRACT FROM AUTHOR]

The separation of ethane and ethylene is an important segment in the purification of chemical raw materials in industrial production. However, due to their similar physical and chemical properties, the separation of C2H6/C2H4 is challenging. Herein, we report the selective adsorption of ethane over ethylene by a microporous metal‐organic framework with nonpolar aromatic rings constructed channels, [Co1.5(TATB)(H2O)0.5] ⋅ 5DMA ⋅ 3H2O (Co‐TATB, H3TATB=4,4',4"‐(s‐triazine‐2,4,6‐triyl) tribenzoic acid). This compound showed a higher ethane capacity than that of ethylene, and a low adsorption enthalpy of ethane only of 19.4 kJ mol−1. Further, the dynamic breakthrough experimental confirmed that Co‐TATB can selectively adsorb ethane from ethane/ethylene separation. [ABSTRACT FROM AUTHOR]

The formation, and subsequent structural, thermal and adsorptive properties of single‐component metal–organic framework crystal‐glass composites (MOF‐CGCs) are investigated. A series of novel materials exhibiting chemically identical glassy and crystalline phases within the same material were produced, where crystalline ZIF‐62(Zn) was incorporated within an agZIF‐62(Zn) matrix. X‐ray diffraction showed that the crystalline phase was still present after heating to above the glass transition temperature of agZIF‐62(Zn), and interfacial compatibility between the crystalline and glassy phases was investigated using a mixed‐metal (ZIF‐62(Co))0.5(agZIF‐62(Zn))0.5 analogue. CO2 gas adsorption measurements showed that the CO2 uptakes of the MOF‐CGCs were between those of the crystalline and glassy phases. [ABSTRACT FROM AUTHOR]

Monomeric oxidovanadium(IV) citrate and malate, [VO(H2cit)(Him‐py)] ⋅ H2O (1) and [VO(R,S‐Hmal)(Him‐py)] (2), and an additive of mixed‐valence oxidovanadium(IV/V) (1H‐imidazol‐2‐yl)pyridine [V2O2(μ2‐O)(glyc)(Him‐py)2(im‐py)] ⋅ [VO2(Him‐py)(im‐py)] ⋅ 9.5H2O (3) [Him‐py=2‐(1H‐imidazol‐2‐yl)pyridine, H4cit=citric acid, R,S‐H3mal=R,S‐malic acid, H2glyc=glycolic acid] have been isolated from the reactions of vanadyl sulfate with α‐hydroxycarboxylate (citrate, malate, and glycolate) and 2‐(1H‐imidazol‐2‐yl)pyridine in acidic solutions, respectively. The citrate or malate chelates to vanadium atom tridentately through α‐hydroxy, α‐carboxy and β‐carboxy groups that different with bidentate glycolate, while the other β‐carboxy acidic group of citrate in 1 remains uncoordinated and participates in strong hydrogen bonds with water molecules. Further substitution of 2‐(1H‐imidazol‐2‐yl)pyridine for citrate in 1 results in the formation of [VO2(Him‐py)(im‐py)]3 ⋅ 4.5H2O (4) in basic solution. With comparable chelation, 1 shares a similar V−Oα‐hydroxy distance [2.214(2) Å] with that observed in FeV‐cofactor [2.156av Å],[1] where a protonated model is suggested for the local chelated environment of FeV‐cofactor in citrate‐substituted V‐nitrogenase variant. Interestingly, 2D porous structure of additive 3 features two types of irregular microchannels with diameters of 16.6 and 6.4 Å, respectively, which can adsorb CO2 and O2 for 9.28 and 29.68 mg/g at 29.89 bar, respectively, while little or no adsorption for H2, N2, and CH4. [ABSTRACT FROM AUTHOR]

Amorphous carbon (aC) is widely used as the adsorbent in the purification of industrial gas. Introducing nitrogen dopant can regulate the morphology and improve the adsorption capacity of specific species. Due to the amorphous structure, it is difficult to understand the relationship between structural features and adsorption performance through atom‐based simulation. Here, a series of nitrogen‐doped amorphous carbon (N‐aC) models is built through reverse Monte Carlo method. The uptakes of three common gases, i.e., CO2, CH4, and N2 are estimated in each constructed framework by using grand canonical Monte Carlo (GCMC). Deep neural network is trained based on the simulated adsorption capacity with nitrogen content, surface area, pore size, atomic charge, and other factors. Through the data‐driven approaches, the adsorption capacity and the selectivity of three gases are predicted. The simulation in this study shows that the nitrogen content has less influence on the capacity and selectivity than the structural parameters, while nitrogen doping may improve CO2 loading and separation selectivity in the nanopores with pore size close to gas molecules. This work is helpful in constructing amorphous carbon structures for further simulation and understanding the influence of various features on gas separation. [ABSTRACT FROM AUTHOR]

The effective shaping of adsorbents is essential to guarantee a high‐efficiency energetic process in what concerns adsorptive applications. In this way, additive manufacturing is gaining significance in developing structured materials in the field of gas adsorption processes. Additive manufacturing is a promising alternative to the traditional shaping techniques, which possess some drawbacks. This paper aims to review the state‐of‐art of additive manufacturing technologies in the manufacturing of adsorbent structures. To do so, an overview of the existent shaping techniques is done, followed by a summarized description of the leading existing additive manufacturing technologies. Then, the application of additive manufacturing technologies to the development of adsorbent materials and other materials for chemical engineering‐related applications is also reviewed. [ABSTRACT FROM AUTHOR]

Porous organic networks (PONs) are an emerging class of organic materials with 2D and 3D architectures formed by covalent bonds between light elements, such as C, H, N, O, and B. Extensive efforts have been devoted to synthesizing thermally "stable" 3D PONs to realize their practical applications. Here, the design and synthesis are reported for two new 3D PONs with fused aromatic structures. The PONs structures are constructed by the double condensation reaction between tetrapodal octaamine and pyrenetetraketone (PTK) or hexaketocyclohexane (HKH) to produce PTK-PON (P-PON) or HKH-PON (H-PON), respectively. The prepared nitrogen-rich PONs show good thermal stabilities with specific surface areas of 873 m² g-1 (P-PON) and 741 m² g-1 (H-PON). Because of their relatively narrow pore dimensions (1.29 and 0.78 nm, respectively), the synthesized PONs exhibit high adsorption performance for small molecules such as carbon dioxide (CO2), hydrogen (H2), methane (CH4), and iodine (I2). [ABSTRACT FROM AUTHOR]

Triazine‐based materials with porous structure have recently received numerous attentions as a fascinating new class because of their superior potential for various applications. However, it is still a formidable challenge to obtain triazine‐based materials with precise adjustable meso‐scaled pore sizes and controllable pore structures by reported synthesis approaches. Herein, we develop a solvent polarity induced interface self‐assembly strategy to construct mesoporous triazine‐based carbon materials. In this method, we employ a mixed solvent system within a suitable range of polarity (0.223≤Lippert–Mataga parameter (Δf) ≤0.295) to induce valid self‐assembly of skeleton precursor and surfactant. The as‐prepared mesoporous triazine‐based carbon materials possess uniform tunable pore sizes (8.2–14.0 nm), high surface areas and ultrahigh nitrogen content (up to 18 %). Owing to these intriguing advantages, the fabricated mesoporous triazine‐based carbon materials as functionalized porous solid absorbents exhibit predominant CO2 adsorption performance and exceptional selectivity for the capture of CO2 over N2. [ABSTRACT FROM AUTHOR]

Zinc terephthalate metal−organic framework (MOF) MOF‐5 and some of its dialkylated derivatives (R2‐MOF‐5; R=Me, Et, Pr, Bu) were obtained from a solvothermal synthesis using 2,5‐dialkyl‐1,4‐benzenedicarboxylic acids with zinc nitrite. The effect of the solvent on the solvothermal synthesis of R2‐MOF‐5 was investigated. For R=H and Me, interpenetrating or non‐interpenetrating MOFs obtained depending on the choice of reaction solvent, while for R=Et, Pr, and Bu, no such solvent effect was observed, and only jungle‐gym‐type MOFs were generated. All compounds were fully characterized using powder X‐ray diffraction analysis (PXRD), Fourier‐transform infrared (FT‐IR) spectroscopy, and thermogravimetric analysis (TGA). After activation, all these compounds exhibit significant porosity, as confirmed by N2‐, H2‐, and CO2‐sorption experiments. The N2‐adsorption capacity of these compounds depends on the size of the attached alkyl groups, while the H2‐uptake values tend to increase for the alkyl‐functionalized MOFs relative to the unfunctionalized parent MOFs and exhibit a maximum value for Pr2‐MOF‐5. [ABSTRACT FROM AUTHOR]

Coalbed methane (CBM) is an important resource of energy. For CBM recovery, sorption‐induced coal deformation can cause significant reservoir permeability change. Moisture content and coal pore morphology affect the gas adsorption capacity and can alter the coal deformation of the coal seam. Therefore, it is crucial to establish a coal gas moisture‐coupled model for CBM production prediction. However, there are currently insufficient data available for quantitative analyses. In this paper, a series of typical sorption‐induced strain experiments were carried out during methane adsorption and desorption on coal samples with different metamorphic degrees and moisture content. The pore morphology and adsorption capacity of coals were measured to analyze the reason for different deformation of coals with various pore structures and moisture. Results show that the adsorption capacity and deformation is corresponding to the specific surface area of micropore, which first decreases and then increases with coal ranks. The deformation and adsorption gas content of dried coals is greater than that of natural moisture coals, which means that moisture can reduce the sorption capacity of coals, resulting in the decrease of gas adsorption‐induced coal deformation. There is also residual deformation of coal samples after gas desorption caused by the residual adsorbed gas in coals. This paper quantitatively investigates the effects of pore characteristics and moisture on coal deformation and the internal mechanism. This work will provide essential information for building out a fully cross‐coupled model of coal gas‐moisture relationships for CBM production prediction. [ABSTRACT FROM AUTHOR]

Novel molybdenum(VI/V) POM‐based self‐constructed frameworks [MoVI12O24(μ2‐O)12(trz)6(H2O)6] ⋅ 6Hma ⋅ 18H2O (1, Htrz=1H‐1,2,3‐triazole, ma=methylamine), [MoVI7O14(μ2‐O)8(trz)5(H2O)] ⋅ 7Hma ⋅ 5H2O (2), Na3[MoV6O6(μ2‐O)9(Htrz)3(trz)3] ⋅ 7.5H2O (3) and [MoV8O8(μ2‐O)12(Htrz)8] ⋅ 30H2O (4) have been covalently decorated with tri‐coordinated deprotonated/protonated 1,2,3‐triazoles. Channels with an inner diameter of 7.5 Å were found in 1, whereas a tunnel composed of stacking molecules with an inner diameter of 4.1 Å along the b‐axis exists in 2; it is occupied by free disordered methylamines, showing selective adsorption of O2 and CO2 at 25 °C. Obvious downfield shifts were observed by 13C NMR spectroscopies for methylamines inside the confined channels in 1 and 2. There are diversified pores in 3 and 4, which are formed by the molecules themselves and intermolecular accumulations. Adsorption tests indicate that 3 and 4 are fine adsorption materials for CH4 and CO2 under low pressure that rely on the environments built by the POMs. Correspondingly, 1 and 2 display reversible photoresponsive thermochromism that is subtlety influenced by the channels. The polyoxometalate organic frameworks (POMOFs) with multiple functional adsorptions are easy to assemble. Their photo‐/thermoresponse properties offer a new pathway for the self‐constructions of one‐off hybrid materials that possess the good properties of both POMs and MOFs. [ABSTRACT FROM AUTHOR]

A polymer of intrinsic microporosity (PIM) consisting of Tröger's base (TB) undergoes ring opening of the bicyclic amine upon N‐methylation followed by alkaline hydrolysis, resulting in a hybrid ladder polymer that contains diazacyclooctane (DACO) units with tert‐ and sec‐amino groups. The hybrid ladder polymers with various TB/DACO ratios can be prepared depending on the reaction conditions. Here we report a systematic study on the effect of DACO content on the thermal and gas adsorption properties of the hybrid ladder polymer. Using a PIM derived from 2,5‐diamino‐p‐xylene, we prepared hybrid ladder polymers with a DACO content ranging from 19% to 55% while having a similar molecular weight. The thermal stability of the hybrid ladder polymers, evaluated by thermogravimetric analysis, is decreased with the increase in DACO content. Based on gas adsorption measurements, the increase in DACO content results in the decrease in the BET surface area but improves the gas adsorption selectivity for CO2 against N2, likely due to high basicity of the sec‐amino group of DACO unit. This result demonstrates that the partial TB‐to‐DACO conversion of the TB‐based PIM may provide a simple but useful strategy to design polymer materials that enable selective CO2 capture and/or separation. [ABSTRACT FROM AUTHOR]

A new 3D porous Zn(II) compound [Zn2(L)2(C2O4)]n ⋅ 2(DMA) (1, HL=4‐(4‐carboxyphenyl)‐2,2′ : 4′,4′′‐terpyridine, DMA=N, N'‐dimethylacetamide) was successfully synthesized with carboxyphenyl‐terpyridine ligand. X‐ray structural analysis revealed that compound 1 features a 2‐fold interpenetrated framework with (3,4)‐connected network topology. Despite interpenetration, compound 1 still contains high solvent‐accessible free volume owing to the existence of large 1D nanotube channels. Gas adsorption properties investigation of the activated 1 a confirms its high BET surface area, high CO2 uptake capacity and excellent adsorption selectivity of CO2 over CH4. Luminescent properties investigation indicate that compound 1 displays intense luminescence at room temperature. [ABSTRACT FROM AUTHOR]

A new thermostable Sr(II) compound, formulated as [Sr(bdc)(H2O)(DMF)]n ⋅ x(solvent) (1, H2bdc=terephthalic acid, DMF=N,N'‐dimethylformamide), has been synthesized from the solvothermal reaction of Sr(NO3)2 and H2bdc. The X‐ray structural analysis revealed that compound 1 features a 3D framework based on 1D Sr(II)‐carboxylate chains, and the coordinated and free solvent molecules filled in the 1D channels of 1, which can be easily removed from the 3D framework via heat treatment activation. The obtained solvent‐free samples 1 a not only shows high adsorption capacities of C2H2 and CO2 at 298 K, moderate adsorption selectivity for C2H2/CH4, CO2/CH4, but also can be used as a luminescent probe for the detection of nitroaromatic explosives. [ABSTRACT FROM AUTHOR]

The size of single crystals of the metal‐organic framework CPO‐27‐Ni was incrementally increased through a series of modulated syntheses. A novel linker modulated synthesis using 2,5‐dihydroxyterephthalic acid and the isomeric ligand 4,6‐dihydroxyisophthalic acid yielded large single crystals of CPO‐27‐Ni (∼70 μm). All materials were shown to have high crystallinity and phase purity through powder X‐ray diffraction, electron microscopy methods, thermogravimetry, and compositional analysis. For the first time single‐crystal structure analyses were carried out on CPO‐27‐Ni. High BET surface areas and nitric oxide (NO) release efficiencies were recorded for all materials. Large single crystals of CPO‐27‐Ni showed a prolonged NO release and proved suitable for in situ single‐crystal diffraction experiments to follow the NO adsorption. An efficient activation protocol was developed, leading to a dehydrated structure after just 4 h, which subsequently was NO‐loaded, leading to a first NO loaded single‐crystal structural model of CPO‐27‐Ni. [ABSTRACT FROM AUTHOR]

Here we report the subcomponent self‐assembly of a truxene‐faced Zn4L4 tetrahedron, which is capable of binding the smallest hydrocarbons in solution. By deliberately incorporating inward‐facing ethyl groups on the truxene faces, the resulting partially‐filled cage cavity was tailored to encapsulate methane, ethane, and ethene via van der Waals interactions at atmospheric pressure in acetonitrile, and also in the amorphous solid state. Interestingly, gas capture showed divergent selectivities in solution and the amorphous solid state. The selective binding may prove useful in designing new processes for the purification of methane and ethane as feedstocks for chemical synthesis. [ABSTRACT FROM AUTHOR]

A new strategy uses a common feature of metal–organic frameworks (MOFs), namely porosity rather than functionality, to achieve simultaneous interior and exterior modification of a MOF with polymers. We demonstrate that an anhydride‐terminated polyimide oligomer can be covalently grafted to the amine‐functionalized methacrylate polymer backbone residing underneath the MOF surface and physically entangled within the 3D nanochannels. The MOF particles were evenly coated with a thin layer of polyimide brushes on the surface thereby exhibiting increased dispersibility in solvent media as well as in polymer matrix. The MOF pores were decorated with aliphatic amine groups to endow the MOF with higher CO2 affinity at low pressure. The polyimide‐grafted surface allowed MOF particles to interact favorably with the polyimide matrix, producing defect‐free MMM with drastically improved CO2 permeability and maintaining the inherent CO2/N2 and CO2/CH4 selectivity of the neat polymeric membrane. [ABSTRACT FROM AUTHOR]

Due to greenhouse gas emission restrictions and environmental protection requirements, the treatment of SO2 and Perfluorinated compound gas has become a problem in the aluminum electrolysis industry. Based on the density functional theory, the adsorption mechanisms of SO2 and CF4 on the surface of clean α‐Al2O3 (0001) were studied. Using projected augmented wave/Perdew‐Burke‐Ernzerhof for calculation, it can be found that SO2 is adsorbed to form an AlO1SO2 structure, and the most stable adsorption energy is −1.52 eV. The adsorption of SO2 is mainly due to the action of π‐p orbitals and the partial contribution of sp2 hybrid orbitals and s orbitals. The most stable adsorption energy of CF4 is −0.38 eV, and it is difficult to transfer charge on the surface. Overall, SO2 is chemisorbed on the clean surface, while CF4 is physisorbed, and their coadsorption with H2O is disadvantageous to the adsorption reaction. These results are very important for understanding the adsorption mechanism of CF4 and SO2 on alumina. [ABSTRACT FROM AUTHOR]

Building on the MOF approach to prepare porous materials, herein we report the engineering of porous BN‐doped materials using tricarboxylic hexaarylborazine ligands, which are laterally decorated with functional groups at the full‐carbon 'inner shell'. Whilst an open porous 3D entangled structure could be obtained from the double interpenetration of two identical metal frameworks derived from the methyl substituted borazine, the chlorine‐functionalised linker undergoes formation of a porous layered 2D honeycomb structure, as shown by single‐crystal X‐ray diffraction analysis. In this architecture, the borazine cores are rotated by 60° in alternating layers, thus generating large rhombohedral channels running perpendicular to the planes of the networks. An analogous unsubstituted full‐carbon metal framework was synthesised for comparison. The resulting MOF revealed a crystalline 3D entangled porous structure, composed by three mutually interpenetrating networks, hence denser than those obtained from the borazine linkers. Their microporosity and CO2 uptake were investigated, with the porous 3D BN‐MOF entangled structure exhibiting a large apparent BET specific surface area (1091 m2 g−1) and significant CO2 reversible adsorption (3.31 mmol g−1) at 1 bar and 273 K. [ABSTRACT FROM AUTHOR]

The Vienna Basin is a major hydrocarbon province with a long exploration history. Within the basin, secondary migration from Upper Jurassic source rocks into stacked Middle Miocene (Badenian) sandstone reservoirs was formerly considered to have occurred almost entirely along major fault zones. However recent exploration data has suggested that in areas where no major faults are present, oil may have migrated vertically through the sandy mudstone intervals separating individual reservoir units, which are therefore imperfectly sealed. In order to investigate possible secondary migration through the semi‐permeable mudstones, this study links variations in gross depositional environment (GDE) to variations in mudstone properties (e.g. mineralogy and pore size distribution). The study focussed on the mudstones which seal reservoir sandstones referred to locally as the "8.TH" and "16.TH" units. The bulk mineralogical composition of 56 mudstone and sandy mudstone (and minor intercalated muddy sandstone) samples from seal layers in 22 wells was studied by X‐ray diffraction analysis, broad ion beam – scanning electron microscopy (BIB‐SEM), mercury intrusion porosimetry (MICP) and N2 adsorption. These data are interpreted in the context of GDE maps of the Vienna Basin which were previously established using seismic and well log data. Results indicate that the gross depositional environment strongly controlled the pore space characteristics of the mudstones. The sandy mudstones in the NW part of the study area were influenced by a complex eastward‐prograding deltaic system which deposited coarse detritus into a major palaeo depression ("Zistersdorf Depression") located in the centre of the basin. Higher overall porosity and a dominance of larger pore size classes, probably resulting in reduced seal quality, were observed for sandy mudstones from well locations within feeder channels and also from within the Zistersdorf Depression. Similarly, sandy mudstones from locations associated with the long‐term input of coarser sediments in shoreline, coastal and proximal offshore settings in the NW and central parts of the study area are considered to be of lower sealing quality compared to fine‐grained mudstones deposited in distal, open‐marine settings which prevailed in the SE part of the study area throughout the Middle Miocene. In general, pore geometries were influenced by mineralogical composition; quartz‐ and detrital carbonate‐rich samples show equidimensional pores, while more elongated pores (with a higher average aspect ratio) characterize clay‐rich samples. Furthermore, matrix mesopores (2‐50 nm) determined by N2 sorption are more abundant in clay‐rich versus quartz‐rich samples, and show a pronounced positive trend with increasing percentage of illite‐smectite mixed‐layer clay minerals. This study shows that regional‐scale mudstone seals in the Vienna Basin have been influenced by variations in sedimentation associated with lateral variations in gross depositional environment during the Middle Miocene. The observed pore characteristics will serve as input data for future models of secondary migration. [ABSTRACT FROM AUTHOR]

Distribution of particulate matter (PM), toxic, and greenhouse gases in the atmosphere are responsible for air pollution, human health issues, and enhanced global warming. Traditional polymeric nanofibers only can remove PMs from air flue. The objective of this study was to investigate the adsorption capacity and selectivity of hybrid nanofibrous filter media based on polyacrylonitrile (PAN) with different percentages of activated carbon particles such as gas adsorbent for removal of sulfur dioxide (SO2), carbon dioxide (CO2), and methane (CH4) from gaseous streams The adsorption isotherms of SO2, CO2, and CH4 on the hybrid samples were measured at 298, 323, and 348 K and with a pressure range of 0–21 bar by means of the volumetric adsorption method. Uniform PAN nanofiber filter (PANNF) with an average diameter of 273 nm was achieved via the electrospinning process after the optimization of different parameters. Waste tea‐derived activated carbons (ACs) by using phosphoric acid as the activation agent was synthesized through two different methods, chemical activation to obtain the micro size of AC (MAC), and microwave radiation energy to obtain nano size of AC (NAC). Hybrid nanofibers were functionalized with dispersing homogenous solutions containing AC particles by the electrospray process. The effect of high and low loading of NAC and MAC on the PANNF surface was studied to increase our understanding about gas adsorption properties of prepare samples. The samples were characterized by Image analysis (ImageJ), Statistical package for social science (SPSS), Scanning electron microscopy (SEM), X‐ray diffraction (XRD), Fourier transform infrared (FT‐IR), Energy‐Dispersive x‐ray (EDX), and Nitrogen adsorption/desorption isotherms. [ABSTRACT FROM AUTHOR]

Cyclic peptoids are macrocyclic N‐substituted oligoglycines, with remarkable structural, chemical and physical properties. The gas adsorption properties of a permanently porous hexameric cyclopeptoid decorated with four propargyl and two methoxyethyl side chains were monitored by in situ X‐ray powder diffraction (XRPD). High‐resolution XRPD data together with Rietveld and density functional based tight binding (DFTB) method allowed us to locate propyne guest molecules inside the host channels, even though the powder sample contains more than one phase. We were able to characterize the host‐guest interactions, providing useful information on the host recognition sites and discuss host adaptiveness and host–guest chemical affinity in comparison with analogous compounds. [ABSTRACT FROM AUTHOR]

Introduction of pore partition agents into hexagonal channels of MIL‐88 type (acs topology) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′‐dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore‐space partition. The Co2V‐pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g−1 (298 K) and 330 cm3 g−1 (273 K) at 1 atm for CPM‐733‐dps (the Co2V‐BDC form, BDC=1,4‐benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low‐energy‐cost adsorbent regeneration. CPM‐733‐dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption–desorption cycles. [ABSTRACT FROM AUTHOR]

Introduction of pore partition agents into hexagonal channels of MIL‐88 type (acs topology) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′‐dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore‐space partition. The Co2V‐pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g−1 (298 K) and 330 cm3 g−1 (273 K) at 1 atm for CPM‐733‐dps (the Co2V‐BDC form, BDC=1,4‐benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low‐energy‐cost adsorbent regeneration. CPM‐733‐dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption–desorption cycles. [ABSTRACT FROM AUTHOR]

Introduction of pore partition agents into hexagonal channels of MIL‐88 type (acs topology) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′‐dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore‐space partition. The Co2V‐pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g−1 (298 K) and 330 cm3 g−1 (273 K) at 1 atm for CPM‐733‐dps (the Co2V‐BDC form, BDC=1,4‐benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low‐energy‐cost adsorbent regeneration. CPM‐733‐dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption–desorption cycles. [ABSTRACT FROM AUTHOR]