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The research progress of metal-organic framework (MOFs) materials in photocatalytic carbon dioxide (CO2) cycloaddition reaction in recent years was reviewed ・ The mechanism of cycloaddition reaction of CO2 under photocatalysis was analyzed, and four modification strategies of MOFs were introduced, including structural defects of MOFs, MOFs with active catalytic metal s让es, heterojunctions with semiconductor materials, and co-catalyst functionalization of MOFs. Based on the current research status of CO2 cycloaddition reaction, the prospects and challenges of MOFs and its composites in the field of photocatalysis are presented. [ABSTRACT FROM AUTHOR]

By enlarging the H-type reactor, formic acid is produced by electrocatalytic reduction of carbon dioxide using indium metal sheet and tin metal sheet electrodes with an area of more than 100 cm2 ・ The selectivity of carbon dioxide reduction reaction products, electrolysis ability and other aspects were studied, and the optimization method of electrocatalytic formic acid production in large-scale metal electrode reactor was obtained・ The results show that the optimal conditions for the reaction are the air inlet flow rate of 40 mL/min, the current density of 一 3.0 to 一4.5 mA/cm2, and the neutral electrolyte. [ABSTRACT FROM AUTHOR]

The mechanism and main research status of the key technologies for the conversion and utilization of carbon dioxide resources are introduced in detail, and on this basis, the main problems existing in various conversion technologies are analyzed deeply, and their future development trend is pointed out, so as to provide the corresponding scientific theoretical basis for ensuring the effective implementation of the conversion and utilization technology of carbon resources. [ABSTRACT FROM AUTHOR]

This study conducted C02-brine・rock reaction experiment to explore the influence of reaction on reservoir wettability, microscopic pore structure, movable fluid saturation, gas flooding effect and other four aspects・ The results show that C02 injection process, the reservoir wettability is like water wet, corrosion will happen at the same time, the recrystallization has been creating the phenomenon such as secondary minerals, resulting in micron grade dissolution pore and sub -micron and nanometer shouted congestion, ultimately affect the movable fluid can be gas injection reservoir development effect, the alkali feldspar in the reservoir and sialic acid salt content is relevant. This study has certain guiding significance for whether the reservoir is suitable for CO2 gas flooding. [ABSTRACT FROM AUTHOR]

In order to investigate the effect of nanoparticles on CO2 capture in aqueous solutions of 2-diethylaminoethanol (DEEA) and N-methyldiethanolamine (MDEA), nanofluids with different types and sizes of nanoparticles were prepared by two-step method. The relationship between the absorption ca- pacity, absorption rate, circulating desorption capacity of alcohol amine aqueous solution and nanoparticles was investigated. The results show that the absorption and desorption of CO2 by DEEA and MDEA solu- tions are enhanced by adding TiO2, SiO2, and grapheme (GO) nanoparticles improved the mass transfer between gas and liquid. The 30% DEEA-0.05% 25 nm TiO2, 30% MDEA-0.05% 40 nm TiO2, 30% MDEA-0.06% GO systems increased the CO2, absorption by 9. 86%, 11.26% and 13.8%; the absorption rate was increased by 33.43%,49.72% and 39.23%; the desorption amount was increased by 10.72%, 9.19% and 26.66%. By 13C NMR and FTIR characterization, it was found that the addition of nanoparticles improved the mass transfer between gas and liquid, and no new substances were produced. [ABSTRACT FROM AUTHOR]

The research focuses on the latest research progress of MOFs materials in the field of singlecomponent C02 adsorption in the past five years・ And introduces in detail several MOFs materials that have been intensively studied in recent years, mainly classified according to the commonly used MOFs materials at home and abroad, such as IRMOFs, MILs, UiOs, ZIFs, and other series・ CO2 Adsorption performances and mechanisms are analyzed, such as doping metal or nitrogen atoms, adjusting their pore size, amino-functionalization and synthesizing MOFs composite materials, and the future development direction is prospected, provides a systematic understanding of MOFs, with a view to providing MOFs for application to engineering practice. [ABSTRACT FROM AUTHOR]

For semiconductor materials TiO2 and Cu2S with different band gaps as photocatalysts, the effects of different light intensity, temperature, pressure reaction conditions, and light-gathering reaction conditions on CO2 reduction rate were studied. The results show that the photocatalysis efficiency of the materials change obviously before and after changing the reaction conditions. The reduction rate of CO2 could be effectively improved by light-gathering reaction. Through XRD analysis and SEM analysis, the efficiency improvement is not due to the formation of new substances and the change of crystals. The optimal reaction conditions can greatly improve the photocatalytic performance. [ABSTRACT FROM AUTHOR]

The C-Cu2O composite electrode was prepared from Cu sheet. The SEM showed that the C-Cu2O composite electrode had a micro network structure, which greatly improved the micro surface area. CO2 can be electrochemically reduced to CH3OH with C-Cu2O composite as cathode in alkaline ethanol solution containing KOH. The optimum conditions for the yield of CH3OH were determined by orthogonal design. The results showed that the Faraday efficiency of CH3OH was 82% when the electrolyte composition was 90% C2H5OH and 2 g/L KOH, the flow rate o£ CO2 was 10 min/mL, and the cathode voltage was -L0 V(vs.SCE). [ABSTRACT FROM AUTHOR]

The research constructed membrane absorption CO2 device with PP hollow fiber membrane as membrane contactor, and three alkolamine solutions: monoethanolamine (MEA), diethanolamine (DEA) and methyldiethanolamine (MDEA) as absorption liquid, respectively. The effects of operating conditions on CO2 removal were investigated. The results revealed that when the absorption fluid concentration creased from 0. 25 mol/L to L 5 mol/L, flow rate 150 mL/min to 400 mL/min, the CO2 removal efficiency gradually increased and the rate of increase slowed down; while the increase of gas flow rate, fluid flow rate and CO2 volume fraction inhibited the removal efficiency of CO2, which was reduced by more than 20%. The mass transfer rate was positively correlated with the concentration of absorption solution, gas phase flow rate, fluid flow rate and CO2 volume fraction. Under the same operating conditions, the removal efficiency and mass transfer rate was: MEA > DEA > MDEA; CO2 removal efficiency and mass transfer efficiency were mainly affected by CO2 concentration. [ABSTRACT FROM AUTHOR]

The desulfurization performances of semi-cokes (XR and ZR) produced by different pyrolysis processes were analyzed. It was found that the breakthrough sulfur dioxide capacity of both XR and ZR were less than 2. 5 mg/g. Therefore, the raw semi-cokes are not suitable for flue gas desulfurization direct. ly. Two kinds of activated semi-coke XC and ZC were prepared by CO2 activation method, and their desulfurization performances and pore structures were investigated. The result shows that activated semi-coke ZC has the best comprehensive performance. The optimized preparation process conditions are activation temperature of 950 °C, activation time of 2 h, CO2 flow rate of 150 mL/min. The comprehensive sulfur dioxide capacity of ZC reaches 70. 9 mg/g. Both XC and ZC have rich microporous structures, and the pore size distribution is mainly concentrated at 1.20 nm and 1. 84 nni. [ABSTRACT FROM AUTHOR]

In order to slow down the corrosion damage of cement in oil and gas wells containing CO2 and prolong the production life of wellbore, a polymer microsphere corrosion inhibitor（PSAC） was prepared. The microstructure of PSAC was characterized firstly, and then its corrosion resistance was evaluated. Finally, the anti-corrosion mechanism of PSAC was discussed. The results show that PSAC has nano scale and core-shell structure, it endows oil well cement with impermeability, which will improve its impermeability and compactness, and effectively slows down the corrosion rate of cement stone. PSAC can improve the compactness and impermeability of cement stone by film-forming effect and microsphere filling effect from PSAC, and reduce the initial content of Ca（OH)2, so as to improve the CO2 corrosion resistance of cement stone. [ABSTRACT FROM AUTHOR]