Article
Energy & Fuels
Wenjie Deng, Jie Yao, Lei Shi
Summary: A porous calcium aluminum hydrotalcite material was discovered in this study, showing excellent catalytic ability in transesterification reactions and outperforming traditional basic catalysts in stability and sustainability.
Article
Engineering, Chemical
Junteng Ma, Weihua Shen, Wenxuan Wei, Yunjin Fang
Summary: The catalytic activity of an ionic liquid catalyst decreased during the transesterification reaction of propylene carbonate with methanol to dimethyl carbonate. This deactivation was attributed to the interaction between the strong basic sites of the catalyst and the carbonyl compounds present in the reaction mixture. The presence of water accelerated this deactivation process by generating OH- ions, which reacted with the carbonyl structures in the reaction mixture to form inactive HCO3- compounds, leading to catalyst deactivation. A plausible mechanism for this deactivation was proposed.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yueyue He, Huaigang Cheng, Zihe Pan, Fangqin Cheng
Summary: The use of ultrasonic process intensification in the alcoholysis of ethylene carbonate to produce DMC can improve conversion rates and reaction efficiency. The ultrasonic technology accelerates the reaction rate, shortens the reaction time, and enhances the catalyst performance. The cavitation bubbles created by ultrasound provide a new physical and chemical environment for chemical reactions, leading to improved mixing, mass transfer, and reaction acceleration.
REACTION CHEMISTRY & ENGINEERING
(2021)
Article
Engineering, Chemical
Jianyu Zhu, Danyang Chen, Ziqing Wang, Qin Wu, Zhili Yin, Zhong Wei
Summary: The transformation of glycerol into high value-added fine chemicals has attracted increasing attention in the biodiesel industry. Researchers successfully prepared a highly active mesoporous CaO-SBA-15 solid base catalyst for glycerol carbonate synthesis and systematically investigated its physicochemical properties and structure-activity relationships. The strong interaction between CaO and SBA-15 was found to be responsible for the excellent catalytic performance, providing more reactive sites for the reaction.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Maria Giorgia Cutrufello, Luciano Atzori, Daniela Meloni, Alessandra Piras, Delia Gazzoli, Elisabetta Rombi
Summary: In this study, CeO2, La2O3, and CeO2-La2O3 mixed oxide catalysts with different Ce/La molar ratios were prepared and characterized using various techniques. The activity of the catalysts for dimethyl carbonate synthesis was found to increase with an increase in basic sites density. The formation of dimethyl carbonate favored medium-strength and weak basic sites, while decomposition occurred on the strong ones.
Article
Chemistry, Analytical
Mart Vaartnou, Enn Lust
Summary: The adsorption of I- anions on the Bi(1 1 1) single crystal plane from mixed solutions of propylene carbonate and dimethyl carbonate has been investigated. The Gibbs energy of I- anions adsorption has been calculated using the virial adsorption isotherm. The results show that the adsorption of I- anions in the mixture is slightly lower than in the pure propylene carbonate or ethylene carbonate solutions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Energy & Fuels
Gitanjali Pradhan, Yogesh Chandra Sharma
Summary: Glycerol carbonate is a trending value added chemical in various industries, with researchers focusing on its synthesis from glycerol as a by-product of biodiesel. The use of a highly efficient heterogeneous Mg/ZnO base catalyst for the transesterification of glycerol with dimethyl carbonate was successful in producing glycerol carbonate with high conversion rates.
Article
Green & Sustainable Science & Technology
Shivali Arora, Vijayalakshmi Gosu, U. K. Arun Kumar, Verraboina Subbaramaiah
Summary: The present study investigated the catalytic activity of heterogeneous catalyst for transesterification of glycerol into glycerol carbonate. The study found that lithium impregnated on MCM-41 framework showed better catalytic activity, leading to an increase in the average pore diameter. The optimal conditions for glycerol carbonate yield were determined as 5% Li impregnation, calcination at 450°C, reaction temperature of 90°C for 3 hours, achieving a 93.14% yield.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Gang Wang, Shirun Zhao, Haoyu Yao
Summary: The co-production of dimethyl carbonate (DMC) and ethylene glycol (EG) via transesterification of ethylene carbonate (EC) has been studied using metal chloride-based ionic liquids (ILs) as catalysts. The interaction between cation and methanol, as well as the activation of carbonyl group in EC by metal chloride-contained anion, showed synergistic effects on catalytic transesterification. The reaction rates were affected by the steric hindrance effect of the alkyl group substituted at the N atom in the imidazole ring. The Al2Cl7 species in AlCl3-based IL exhibited activity in the transesterification, and its content showed a linear relationship with the transformative rates of both EC and HEMC. The kinetic studies revealed that the reaction rates were first-order dependent on the concentrations of EC (or HEMC) and methanol, and the formation of HEMC intermediate was the kinetic-relevant step. The catalysis of [MDMIM]Cl/AlCl3 with an AlCl3 molar fraction of 0.67 showed higher performance compared to other metal chloride-based ILs, with a yield and selectivity of DMC (or EG) reaching up to 95% and 97%, respectively, after 12 hours of reaction at 140 degrees C. The IL also demonstrated good recyclability without decay in catalytic activity and selectivity after 10 times' recycling.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Fei Chen, Wensheng Wei, Yunsheng Gao, Yuxin Wang, Zizhen Yan, Zhanguo Zhang, Haiming Yu, Guangwen Xu, Lei Shi
Summary: Ionic liquid [Emim]IM with high thermal stability and strong basicity was synthesized and used as a catalyst for the direct synthesis of dimethyl carbonate (DMC). The [Emim]IM catalyst exhibited good stability and catalytic activity.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Energy & Fuels
Wenqiang Liu, Yajuan Wang, Juan Zhang, Qingwen Shan
Summary: In this study, large particle spherical poly-ionic liquid-solid base catalyst (PILs-FL) was successfully synthesized by suspension polymerization and characterized. The optimal reaction conditions for vinyl carbonate and methanol reaction to form dimethyl carbonate (DMC) were determined. The PILs-FL catalyst exhibited high catalytic activity and stability under the optimized conditions.
Article
Chemistry, Multidisciplinary
Qiang Wei, Gang Zhang, Jie Yao, Xuejun Chen, Gongying Wang, Xiangui Yang
Summary: A novel method for the rapid batch preparation of CaO/carbon catalysts using calcium citrate (CaCi) was developed for the transesterification reaction of methanol and ethylene carbonate (EC) to synthesize DMC and EG. The catalysts were characterized using various techniques, and under optimal process parameters, high conversion and selectivity were achieved. Kinetic analysis showed a reaction rate constant of approximately 0.159 mol L-1 min(-1), and reusability of the catalysts was also investigated.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Energy & Fuels
Yue Yu, Lei Shi, Jianjun Guo, Xin Li, Wenbing Yang, Zhigang Zhang, Guangwen Xu
Summary: This study systematically investigated the influence of various soluble basic catalysts in the production of carbonates, with dimethyl carbonate identified as the cause of catalyst deactivation. The alkali strength, nucleophilicity, and catalyst efficiency were found to increase with decreasing alkalinity coefficient value. The final deactivation species after long-time treatment or recycling was determined to be Na2CO3. The research findings may contribute to the development of more effective homogeneous catalysts for carbonate transesterification processes.
Article
Chemistry, Multidisciplinary
Yu-Fen Bao, Yi-Jie Wang, Yu-Chen Wang, Ding-Hua Liu
Summary: By studying the influence of ionic liquid base strength, we successfully synthesized a potassium imidazole (KIm) organic base catalyst with high catalytic activity and stability, solving the issue of catalyst deactivation in transesterification. The results showed that KIm performed better than most previously reported catalysts, achieving chemical equilibrium within 3 minutes and yielding 73.03% dimethyl carbonate (DMC) in the synthesis from propylene carbonate (PC) and methanol (MeOH). Moreover, the catalyst maintained its activity after ten reaction cycles, meeting the requirements for industrial production.
Article
Green & Sustainable Science & Technology
Bahareh Reisi, Alireza Najafi Chermahini
Summary: MgO/g-C3N4 catalyst was synthesized and used for conversion of glycerol to glycerol carbonate. The catalyst showed high catalytic activity and good reusability under optimal reaction conditions. These findings are important for developing sustainable methods for bio-diesel production.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
Article
Chemistry, Organic
Yonas Belay, Louis-Charl Coetzee, D. Bradley G. Williams, Alfred Muller
TETRAHEDRON LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
Article
Chemistry, Multidisciplinary
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
Article
Chemistry, Applied
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
FUEL PROCESSING TECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Agricultural Engineering
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
INDUSTRIAL CROPS AND PRODUCTS
(2020)
Article
Chemistry, Multidisciplinary
Iurii Bodachivskyi, Charlotte J. Page, Unnikrishnan Kuzhiumparambil, Simon F. R. Hinkley, Ian M. Sims, D. Bradley G. Williams
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Editorial Material
Chemistry, Physical
D. Bradley G. Williams, Iurii Bodachivskyi
Summary: This comment points out misinterpreted data related to the reported synthesis of Bronsted acidic ionic liquids for the dissolution of chitosan. Through various analyses, it is demonstrated that such ionic liquids are unlikely to be produced.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Medicinal
Ibrahim Waziri, Mustafa A. Isa, Molahlehi Sonopo, D. Bradley G. Williams, Alfred Muller
Summary: The study synthesized N-phenyl-N-nitroso hydroxylamine and its derivatives, which showed activity against a range of bacteria, particularly Gram-positive species. Toxicity studies on the lead compound indicated insignificant effects on healthy cell lines. Molecular docking studies helped identify possible binding modes of the compound and confirmed results obtained from in vitro and MIC studies.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Rahau S. Shirazi, Mikhail Vyssotski, Kirill Lagutin, Dion Thompson, Christa MacDonald, Vincent Luscombe, Michelle Glass, Kim Parker, Emma K. Gowing, D. Bradley G. Williams, Andrew N. Clarkson
Summary: N-acylethanolamines (NAE) are important lipid signaling molecules with anti-inflammatory, pain-relieving, cell-protective, and anticancer properties. New NAE with shorter carbon backbone structures showed greater neuroprotection and higher affinity towards cannabinoid receptors compared to traditional NAE.
Article
Chemistry, Inorganic & Nuclear
Yonas Belay, Alfred Muller, D. Bradley G. Williams
Summary: A new two-dimensional coordination polymer has been synthesized and shown to have good catalytic activity for the oxidation of various olefins.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Louis-Charl C. Coetzee, Alfred J. Muller, Adedapo S. Adeyinka, Molahlehi S. Sonopo, D. Bradley G. Williams
Summary: Three 1,2,4-triazole derivatives were synthesized from hydrazides and 2-(2-hydroxyphenyl)-4H-1,3-benzoaxin-4-one. The effect of incorporating para-substituted moieties on the hydrazides was investigated using Conceptual Density Functional Theory (CDFT), Molecular Electrostatic Potential (MEP), and Quantum Theory of Atoms in Molecules (QTAIM) analysis, with characterization of the compounds carried out using H-1 and C-13 NMR, FT-IR, and HRMS.
RESULTS IN CHEMISTRY
(2021)
Article
Engineering, Environmental
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Iurii Bodachivskyi, Unnikrishnan Kuzhiumparambil, D. Bradley G. Williams
CATALYSIS SCIENCE & TECHNOLOGY
(2019)
