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Oxazine is known for its biological and synthetic importance in organic chemistry. Greener synthesis of oxazines represents an advance over other methods owing to its many advantages such as simplicity, affordability, relative reproducibility, and stable products, with no requirement for toxic chemicals, high temperature, energy, or pressure. Herein, the new trends and development in alternative green synthesis of 1,3- Oxazine over the past few years have been emphasized and discussed. [Display omitted] [ABSTRACT FROM AUTHOR]

Abstract: A new, novel, efficient, and stable green catalyst has been successfully used as a catalyst in aqueous ozone decomposition in acidic medium. The catalyst was characterized by using X-ray fluorescence (XRF), transmission electron microscope (TEM), scanning electron microscope (SEM), and X-ray diffraction (XRD) techniques. The sludge mainly consists of various metal and non-metal oxides. The effect of various experimental parameters such as catalyst loading, initial ozone concentrations, and various metal oxide catalysts on the decomposition of ozone was investigated. The decomposition of dissolved ozone was substantially enhanced by increasing the catalyst loading from 125 to 750mg and by increasing the initial ozone concentration. The ozone decomposition efficiencies of Al2O3, SiO2, TiO2, Fe2O3, ZnO, and sludge have been studied and the efficiencies of these catalysts were found to be in the following order: ZnO≈sludge>TiO2 >SiO2 >Al2O3 ≈Fe2O3. The catalytic stability was also investigated for up to four successive cycles and it was found that the catalyst was stable and ozone did not affect the catalyst morphology and its composition. However, the surface area of the catalyst increased after 1st cycle then it became stable. It was concluded that the sludge powder used in this study was a promising catalyst for aqueous ozone decomposition. [Copyright &y& Elsevier]

Abstract: Direct esterification of butanol to butylbutanoate in the absence of butanoic acid has been investigated by a series of green solid acid catalysts, including H14[NaP5W30O110], H 14 -P 5 , H14[NaP5W29MoO110], H 14 -P 5 Mo and silica supported H14[NaP5W30O110], H 14 -P 5 /SiO 2 , with H2O2 as oxidizing agent at reflux and at room temperatures. The performance of these eco-friendly catalysts were compared with H2SO4. Maximum butylbutanoate yield and product selectivity (100%) was observed by using H 14 -P 5 Mo as the catalyst. The effects of various parameters such as catalyst type, reaction times, reaction temperatures, and molar ratio of n-butanol to hydrogen peroxide have been studied. The green catalysts can be easily recovered and recycled with retention of their initial structure and activity. [Copyright &y& Elsevier]

Abstract: Use of highly monodispersed, easily recyclable and cheap nickel nanoparticles for oxidative coupling of aliphatic, aromatic, cyclic and heteroaromatic thiols to their corresponding disulfides has been reported. Ni-nanoparticles act as a green catalyst that can selectively catalyse oxidative coupling of thiols to disulfides without producing any over-oxidized products. The catalytic reaction occurred at room temperature with excellent yield under air atmosphere and high TON and TOF value could be achieved. Effect of solvent polarity and size distribution of the Ni-nanoparticles on the catalytic efficiency have been investigated. Nickel nanoparticles could be easily recovered by mild centrifugation. [Copyright &y& Elsevier]

The current environmental situation has urged researchers to look for alternative green fuels with lower emissions from biomass feedstock. This work aims a greener approach for the heterogeneous catalytic conversion of methanol to dimethyl ether, DME, as an alternative fuel. Thus, a series of phosphorous−containing activated carbon (ACP) derived from orange peel (OP) at different H 3 PO 4 : OP (w/w) rations, as well as a series of tungsten (W)-loaded on ACP, WO 3 /ACP supported catalysts were formed and thermally treated at different temperatures. The formed materials were characterized by XRD, ATR−FTIR, N 2 adsorption/desorption, HRTEM, electron diffraction, EDX, elemental mapping and surface acidity. Effects of H 3 PO 4 ratio and treatment temperature on the bulk and surface properties of the produced catalyst/support materials were investigated. Catalytic activities of the ACP support and W-loaded catalysts towards methanol dehydration in the range of 150–400 °C were measured at WHSV of 2.01 h−1 in an inert atmosphere. Improved catalytic performance was observed for ACP support, which further improved for the W-loaded catalysts. This involved increase of methanol conversion (from 67% to 84%), DME formation rate (from 14.6 to 18.3 mmol.h−1), time-on-stream (from < 40 to >120 h) and E a (from 48.98 to 42.23 kJ mol−1) on moving from ACP support to the most active supported catalyst, respectively. The improvement was attributed to the enhanced textural and thermal stability of the supported catalyst, which places it among the high efficiency catalysts for DME formation. [Display omitted] • Biomass derived P-containing activated carbon (ACP)s were formed and employed as novel catalyst. • ACPs showed good methanol conversion, DME selectivity and stability in inert atmosphere. • W−loaded on ACP, WO 3 /ACP, catalysts showed better catalytic activity and stability. • The most active catalyst showed methanol conversion of 84% and DME selectivity of 100%. • DME formation rate of 18.3 mmol.h−1 and stability time-on-stream of 120 h were obtained. [ABSTRACT FROM AUTHOR]

[Display omitted] • Optimization of operational variables governing the SCWG of chicken manure. • Monitoring the quantitative results of optimized non-catalytic tests. • Preparation of activated carbon as a catalyst support using poultry farm residue. • Ceria effects on catalyst supports morphological characteristics. • Ni-supported catalyst preparation and its influence on hydrogen/syngas production. In recent years, supercritical water gasification has attracted the attention of scientists and environmentalists not only as an alternative method for direct disposal of poultry manure, but also as an efficient hydrogen-rich gas generation process. In this study, by varying the temperature (375–450 °C), residence time (5–35 min), and feed concentration (2.5–3.5 wt%), some non-catalytic supercritical water gasification tests were designed and carried out in a stainless-steel U-type batch reactor to assess the optimum operational condition. To stimulate hydrogen production, catalytic experiments were conducted using the optimized condition (450 °C, 15 min, and 2.5 wt% of feedstock). The prepared catalyst supports and final nanocatalysts (Ni/Activated carbon, Ni/activated carbon-CeO 2 nanorods) were then thoroughly characterized by various analytical instruments to verify the differences between the metal oxide-free and composite-like catalyst supports. Moreover, elemental analysis, gas and liquid chromatography were conducted to provide a deep understanding toward the impacts that composite-like catalyst support could have on diversity and quality of products. The experimental results revealed that, although in catalytic experiments the H 2 yields were higher than those recorded in non-catalytic experiments, highest hydrogen selectivity of 36.42 % could be achieved when Ni/activated carbon-CeO 2 nanorods were employed. [ABSTRACT FROM AUTHOR]

Abstract: Different derivatives of aldehydes/ketones were subjected under reductive amination reaction in the presence of ChCl/Urea as a green and biocompatible catalyst. Sodium borohydride was used as a reducing agent. Secondary amines were achieved with high selectivities and yields. [Copyright &y& Elsevier]

Ionic liquids are one of the greener solvents which have emerged as a replacement for toxic and harmful volatile organic solvents. In the past decade, the concept of supported ionic liquids (SILs) has attracted the attention of the scientific community due to their unique chemical and physical properties. SILs can be synthesized by coating a thin layer of IL film onto/into the surface of solid support. They can be classified as supported IL phase catalyst, solid catalyst with IL and supported IL catalysis. SILs demonstrated the combined properties of both heterogeneous and homogeneous catalysts. These ILs offer several advantages such as enhanced stability, reusability, recoverability, easy product isolation, absence of IL leaching, as compared to conventional solvents. In this review, various aspects of SILs, classification, method of preparation and their applications in various organic transformations such as cross-coupling reactions, oxidation, reduction, synthesis of different heterocyclic compounds, biocatalytic reactions etc., have been discussed., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)

The catalytic reduction reaction is one of the most commonly used solutions to convert high-risk contaminants into safe or low-risk materials. Today, with the increasing water pollution, the urgent need for efficient and effective catalysts is felt more than ever. For this purpose, for the first time, a green catalyst composed of silver nanoparticles anchored on itaconic acid-modified Ca-Al layered double hydroxide/gellan gum nanocomposite (Ag/LDH-ITA-GG NC) was prepared from a green approach without the use of any toxic organic solvents. To gain an in-depth insight into the physicochemical properties of the catalyst, different techniques including nitrogen adsorption-desorption isotherms, FESEM/mapping, FTIR, TGA, and XRD were used. The catalytic performance of the Ag/LDH-ITA-GG NC toward 4-nitrophenol reduction by NaBH 4 was investigated. The calculated values of the apparent rate constant for this reaction are 0.2142 min -1 (for 1.0 mg of the catalyst), 0.2375 min -1 (for 3.0 mg of the catalyst), and 0.2550 min -1 (for 5.0 mg of the catalyst), indicating that the catalytic conversion of 4-nitrophenol to 4-aminophenol on the Ag/LDH-ITA-GG NC catalyst follows the pseudo-first-order kinetics and is comparable to the previous findings in the literature. The results of this study indicated that Ag/LDH-ITA-GG NC can potentially be utilized as an auspicious high efficient green catalyst for the reduction of pollutants like 4-nitrophenol., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Here, we report on a phyto-mediated bimetallic (NiFe2O4) preparation using a Boswellia carterii extract, which was characterized by XRD, FT-IR, TGA, electron microscopy, magnetic spectroscopy, and Mössbauer spectroscopy measurements. The prepared nano-catalysts were tested for oxidation of lignin monomer molecules—vanillyl alcohol and cinnamyl alcohol. In comparison with previously reported methods, the nano NiFe2O4 catalysts showed high photocatalytic activity and selectivity, under visible light irradiation with a nitroxy radical initiator (2,2,6,6-tetramethylpiperidinyloxy or 2,2,6,6-tetramethylpiperidine 1-oxyl; TEMPO) at room temperature and aerobic conditions. The multifold advantages of the catalyst both in terms of reduced catalyst loading and ambient temperature conditions were manifested by higher conversion of the starting material. [ABSTRACT FROM AUTHOR]

[Display omitted] • Immobilization of CuO on paper matrices by an ultrafast (5 min) microwave method. • CuO immobilized paper catalyzes the conversion of CO 2 into cyclic carbonates. • Excellent recyclability of the catalyst (98 % efficiency even after 7 cycles). • Environmental catalyst catalyzes notorious CO 2 to products of industrial importance. Paper matrices immobilized with CuO nanoflakes (width 50−100 nm and length upto 200 nm) by an ultrafast (5 min) microwave assisted method have been used as catalyst for the conversion of CO 2 and epoxides into cyclic carbonates with almost 100 % yield in 20 h at a comparatively low CO 2 pressure of 4 bar. Additionally, some amount of polycarbonate is also formed. The moderate TON of 121 and excellent recyclability performance (98 % retention of the catalytic activity) even after seven catalytic cycles along with the non-detectable leaching of the CuO from the paper matrices and ease of separation of the catalyst, made the CuO immobilized paper matrices a superior catalyst. The cellulose matrices not only act as a support to immobilize the CuO nanoparticles but also acts as a co-catalyst due to the presence of ample amount of hydroxyl groups in this biodegradable natural polymer. The synergy of cellulose and CuO in the immobilized paper matrices for the formation of the products can be seen as only 7 or 40 % conversion were estimated when only paper matrices or CuO was used as the catalysts, respectively. Moreover, as substrate the paper matrices has shown great potential as the destruction and re-fabrication for five consecutive cycles could hold more than 95 % of the immobilized CuO in the paper matrices. [ABSTRACT FROM AUTHOR]

Greatly efficient chemical processes are customarily based upon a catalyst activating the process pathway to achieve higher yields of a product with desired specifications. Catalysts capable of achieving good performance without compromising green credentials are a pre-requisite for the development of a sustainable process. In this study, CeO2 nanoparticles were tested for their catalytic activity with two different configurations, one as a hybrid of CeO2 nanoparticles with Zeolitic Immidazole Framework (ZIF-67) and second being doped Cu cations into CeO2 nanoparticles. Physicochemical and catalytic activity was investigated and compared for both systems. Each hybrid was synthesized by embedding the CeO2 nanoparticles into the microporous structure of ZIF-67, and Cu doped CeO2 nanoparticles were prepared by a facile hydrothermal route. As a catalytic test, it was employed for the oxidation of cyclohexene to adipic acid (AA) as an alternative to expensive noble metal-based catalysts. Heterogeneous ZIF-67/CeO2 found catalytical activity towards the oxidation of cyclohexene with nearly complete conversion of cyclohexene into AA under moderate and co-catalyst free reaction conditions, whereas Cu doped CeO2 nanoparticles have shown no catalytic activity towards cyclohexene conversion, depicting the advantages of the porous ZIF-67 structure and its synergistic effect with CeO2 nanoparticles. The large surface area catalyst could be a viable option for the green synthesis of many other chemicals. [ABSTRACT FROM AUTHOR]

Abstract: A robust synthesis of silver nanoparticles (AgNPs) using the peel extract of Punica granatum is reported in this article. The formation of AgNPs was confirmed by the appearance of brownish yellow color and the Surface Plasmon Resonance (SPR) peak at 432nm. The biogenic AgNPs were found to have the size approximately 30nm with distorted spherical shape. The high negative zeta potential values of AgNPs revealed their high stability which could be attributed to the capping of AgNPs by the phytoconstituents of the Punica granatum peel. The biogenic AgNPs were also found to function as an effective green catalyst in the reduction of anthropogenic pollutant viz., 4-nitrophenol (4-NP) by solid sodium borohydride, which was evident from the instantaneous color change of bright yellow (400nm) to colorless (294nm) solution, after the addition of AgNPs. The catalytic action of biogenic AgNPs in the reduction of 4-NP could be explained on the basis of Langmuir–Hinshelwood model. [Copyright &y& Elsevier]

Abstract: Only 10mol% of Dowex 50W in water proved to be a very efficient catalyst for the synthesis of a wide variety of 2-substituted benzimidazoles. The methodology is mild, high yielding, green and the catalyst could be easily recycled. [Copyright &y& Elsevier]

The dwindling of global petroleum deposits and worsening environmental issues have triggered researchers to find an alternative energy such as biodiesel. Biodiesel can be produced via transesterification of vegetable oil or animal fat with alcohol in the presence of a catalyst. A heterogeneous catalyst at an economical price has been studied widely for biodiesel production. It was noted that various types of natural waste shell are a potential calcium resource for generation of bio-based CaO, with comparable chemical characteristics, that greatly enhance the transesterification activity. However, CaO catalyzed transesterification is limited in its stability and studies have shown deterioration of catalytic reactivity when the catalyst is reused for several cycles. For this reason, different approaches are reviewed in the present study, which focuses on modification of waste-shell derived CaO based catalyst with the aim of better transesterification reactivity and high reusability of the catalyst for biodiesel production. The catalyst stability and leaching profile of the modified waste shell derived CaO is discussed. In addition, a critical discussion of the structure, composition of the waste shell, mechanism of CaO catalyzed reaction, recent progress in biodiesel reactor systems and challenges in the industrial sector are also included in this review. [ABSTRACT FROM AUTHOR]

• The cellulose monolith supports its self-produced gold nanoparticle as flow reactor. • The preparation process is highly efficient, scalable and sustainable. • The obtained cellulose reactor exhibits a good catalytic performance and stability. • The product can be used in both water and organic solvent. Monolithic flow reactors are widely applied in numerous reactions due to its high efficiency and good reusability, but the green and efficient fabrication of monolithic flow catalytic system is still a challenge. Herein, the cellulose monolith prepared using a facile temperature-induced phase separation method was utilized to generate and immobilize the gold nanoparticles by a continuous-flow strategy, in which the cellulose monolith served as both reducing agent and supporting material. This process was conducted at room temperature and avoided the tedious surface modification of cellulose. The obtained cellulose-Au monolith can be directly applied as a green flow reactor in both water and organic solvents, and exhibited superior catalytic efficiency and good stability. This work provides a highly efficient, scalable and sustainable strategy for developing green catalytic system based on environmentally friendly cellulose monolith materials. [ABSTRACT FROM AUTHOR]

• Lemon juice has been explored as catalyst and green solvent in organic synthesis. • Naturally occurring lemon juice is biodegradable, cheap and non-toxic. • Organic transformations can be mediated by lemon juice effectively and selectively. • Lemon juice is a suitable substitute for many toxic metal catalysts. • Lemon juice generates lower waste than traditional chemical methods. Lemon juice has been extensively explored recently as highly selective and efficient biocatalyst as well as green solvent in organic synthesis. Lemon juice holds considerable promise as cheap, easily available, biodegradable, nontoxic and easy-to-construct alternative to well-studied metal-based catalysts and also it is well consistent with green chemistry theme. The present digest paper primarily aims to illustrate the progress of lemon juice mediated organic transformations towards the synthesis of a wide variety of important organic compounds. The mechanistic aspects of the reactions have been highlighted as well. [ABSTRACT FROM AUTHOR]

Here, we report an efficient and highly selective oxidation of lignin model substrate using phyto-mediated ZnFe2O4 nanoparticle using Boswellia carterii extract. The nanocatalyst with an average size of 8 nm showed excellent photocatalytic activity of the synthesized carbonyl containing products under visible light irradiation. The catalytic activity and selectivity towards oxidation of vanillyl alcohol to vanillin with selectivity up to 99% at conversion over 98% and turn-over frequency values up to 1600 h−1 were obtained in the presence of H2O2 and base. The cubic spinel nano-ZnFe2O4 catalyst was characterized by powder-XRD, FESEM, HR-TEM and Mössbauer analysis. The demonstrated catalyst was robust and stable under the reaction conditions. Furthermore, it was easy to be separated from the reaction mixture and be reused for subsequent reactions up to 5 times without significant reactivity or selectivity loss. [ABSTRACT FROM AUTHOR]

The present study deals with the development, characterization, and performance evaluation of an eco-friendly catalyst, using 2-methoxy-4-methylphenol (2M4MP) as a surrogate tar. The 2M4MP was selected due to its chemical functionalities and the fact that it is a good model compound to represent the tar formed during biomass low temperature gasification. The eco-friendly catalyst was prepared using the typical Fe and Ca minerals which are present in ash. These ash components were added to a fluidizable γ-Al2O3 support using a multistep incipient impregnation, yielding Fe oxides as an active phase and CaO as the promoter. The prepared catalyst displayed a 120 m2/g BET specific surface area, with few γ-Al2O3 bulk phase changes, as observed with XRD. TPD-NH3 and pyridine FTIR allowed us to show the significant influence of CaO reduced support acidity. A TPR analysis provided evidence of catalyst stability during consecutive reduction–oxidation cycles. Furthermore, catalyst evaluation vis-à-vis catalytic steam 2M4MP gasification was performed using the fluidized CREC riser simulator. The obtained results confirm the high performance of the developed catalyst, with 2M4MP conversion being close to 100% and with selectivities of up to 98.6% for C1-C2 carbon-containing species, at 500 °C, with a 7.5 s reaction time and 1.5 g steam/g 2M4MP. These high tar conversions are promising efficiency indicators for alumina catalysts doped with Fe and Ca. In addition, the used catalyst particles could be blended with biochar to provide an integrated solid supplement that could return valuable mineral supplements to the soil. [ABSTRACT FROM AUTHOR]

The importance of advanced energy-conversion devices such as water electrolysis has manifested dramatically over the past few decades because it is the current mainstay for the generation of green energy. Anodic oxygen evolution reaction (OER) in water splitting is one of the biggest obstacles because of its extremely high kinetic barrier. Conventional OER catalysts are mainly noble-metal oxides represented by IrO2 and RuO2, but these compounds tend to have poor sustainability. The attention on Prussian blue (PB) and its analogs (PBA) in the field of energy conversion systems was concentrated on their open-framework structure, as well as its varied composition comprised of Earth-abundant elements. The unique electronic structure of PBA enables its promising catalytic potential, and it can also be converted into many other talented compounds or structures as a precursor. This undoubtedly provides a new approach for the design of green OER catalysts. This article reviews the recent progress of the application of PBA and its derivatives in OER based on in-depth studies of characterization techniques. The structural design, synthetic strategy, and enhanced electrochemical properties are summarized to provide an outlook for its application in the field of OER. Moreover, due to the similarity of the reaction process of photo-driven electrolysis of water and the former one, the application of PBA in photoelectrolysis is also discussed. [ABSTRACT FROM AUTHOR]

Thiamine hydrochloride is reported to be a highly competent promoter for the synthesis of bis(indolyl)methanes under solvent free conditions using microwave irradiation and ultrasonicator heating in aqueous media. Vitamin B1 is an economical, non-toxic, nonflammable and water soluble green organocatalyst. Moreover, the simple approach, easily operational, short reaction time, high yield and using a little quantity of thiamine hydrochloride makes this method an alternative approach. Present protocol is a simple and eco-friendly approach for the synthesis of bis(indolyl)methanes under microwave and ultrasonicator conditions., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)

• Zr-PCP-NH 2 was fabricated via ultrasonic irradiation as a fast and green method. • Zr-PCP with different functional moieties was used in BIM synthesis. • Zr-PCP-NH 2 showed higher catalytic activity than pristine Zr-PCP-H. • The catalyst is stable under the reaction conditions. • Zr-PCP-NH 2 can be reused multiple times without significant loss in its efficiency. Herein, the efficient role of ultrasonic irradiation both in synthesis of Zr based porous coordination polymer (Zr-PCP) nanoparticles and boosting its catalytic activity, towards the benzimidazoles synthesis is represented. We use an amine based ligand (amino-terephthalate) for PCP and we exhibit that it can have a synergistic catalytic activity. In this work, a unique nano-engineering of cooperative and synergistic catalytic activity of zirconium, as a Lewis acid, and aminophenylene, as an organocatalyst, in the synthesis of heterocycles is presented for the synthesis of benzimidazole from cascade reaction of phenylene diamine with aldehyde at ambient temperature. Zr and amine groups of the Zr-PCP are active catalytic sites which in combination with the ultrasonic irradiation leads to a high selectivity and rapid catalytic production of benzylimidazoles. N 2 adsorption-desorption along with BJH analyses confirm the microporosity of the catalyst and recyclability shows that the catalyst is green and sustainable heterogeneous microporous catalyst. [ABSTRACT FROM AUTHOR]

From the perspective of green chemistry, in catalytic systems, being low cost and eco‐friendly, in addition to high chemical and thermal stability, are requirements of support materials. In this regard, we used apple seed starch as an accessible, nontoxic, and cost‐effective support material. In order to take advantage of magnetic separation, the magnetite nanoparticles were chosen as an ideal pair for apple seed starch. Furthermore, during the Schiff base reaction, the magnetic apple seed starch was functionalized with 2,2′‐furil along with amine functionality to be used as a bio‐support for immobilization of cobalt. The introduction of cobalt had a significant effect on the greenness of the catalyst and reducing its price. FT‐IR, TGA, XRD, FE‐SEM, TEM, VSM, ninhydrin test, element mapping, AAS, and EDX analysis were applied to characterize the newly prepared catalyst. The effectiveness of this novel Schiff base supported catalyst was evaluated in the Mizoroki–Heck and the Suzuki–Miyaura coupling reactions. High reactivity and selectivity were among the most prominent characteristics of the catalyst as compared to previously reported catalysts. The longevity test and hot filtration showed the ability to use the catalyst at least 5 times and negligible cobalt leaching during the reaction, respectively. This work is the first report on the usage of apple seed starch as a supporting catalyst and 2,2′‐furil as a ligand in the catalyst modifications and catalytic activity. Accordingly, this can be the beginning of an attractive way in the design and synthesis of heterogeneous catalysts. [ABSTRACT FROM AUTHOR]

Seaweed powder has been found to act as an effective catalyst for the fixation of CO2 into epoxides to generate cyclic carbonates under solvent free conditions. Model background reactions were performed using metal halides and amino acids typically found in common seaweeds which showed potassium iodide (KI) to be the most active. The efficacy of the seaweed catalysts kelp (Laminaria digitata) and dulse (Palmaria palmata) was probed based on particle size, showing that kelp possessed greater catalytic ability, achieving a maximum conversion and selectivity of 63.7% to styrene carbonate using a kelp loading of 80% by weight with respect to epoxide, 40 bar of CO2, 120 °C for 3 h. Maximizing selectivity was difficult due to the generation of diol side product from residual H2O found in kelp, along with a chlorinated by-product thought to form due to a high quantity of chloride salts in the seaweeds. Data showed there was loss of organic matter upon use of the kelp catalyst, likely due to the breakdown of organic compounds and their subsequent removal during product extraction. This was highlighted as the likely cause of loss of catalytic activity upon reuse of the Kelp catalyst. [ABSTRACT FROM AUTHOR]

Date palms are predominately produced in arid regions and the date pits, or seeds, produced from them are sometimes considered to be a waste. Date pits, ground to powder following an oil extraction, were used to synthesize a renewable heterogeneous catalyst. The green carbon catalyst was modified by an alkaline earth metal oxide (CaO). The oil extracted from date pits was transformed into biodiesel. The biodiesel process was optimized and the optimal yield was 98.2 wt% at a reaction temperature of 70 °C, reaction time ∼120 min, methanol to oil molar ratio of 12 and catalyst loading of 4.5 wt%. The quality of the produced biodiesel meets the standard limits set by regulating agencies (ASTM, EU) which indicates its suitability to be used as a fuel. Thus, it can be concluded that the green carbon catalyst synthesized from waste date pits has a high potential for biodiesel production.