Article
Chemistry, Applied
Davide Dalla Torre, Mattia Annatelli, Fabio Arico
Summary: Dimethyl isosorbide (DMI) is a bio-based solvent that can replace conventional dipolar media for green purposes. Previous methods for synthesizing DMI involve toxic halogen compounds, while a more sustainable approach is to use dimethyl carbonate (DMC), which is biodegradable and less toxic. This study reports the synthesis of DMI using DMC chemistry promoted by heterogeneous acid catalysts for the first time, optimizing reaction conditions and exploring the reaction mechanisms.
Article
Energy & Fuels
Xiangyang Liu, Sa Xue, Rana Ikram, Chenyang Zhu, Yaohui Shi, Maogang He
Summary: In this study, DMC was used as an additive to reduce the viscosity of n-butanol, resulting in a significant decrease in viscosity and an increase in density, which is expected to improve the performance of n-butanol as an alternative to gasoline. The dependencies of density and viscosity improvements on temperature and pressure were investigated to guide the optimization of combustion processes. Two models were proposed for calculating the viscosities and densities of the binary mixtures of DMC and n-butanol with good accuracy.
Article
Chemistry, Analytical
Feixiong Chen, Seon-yeong Lee, Kyudong Han, Tae Yoon Lee
Summary: A novel molecular diagnostic method was developed for highly efficient detection of gram-negative bacterial pathogens in challenging samples with low abundance and nucleic acid amplification inhibitory factors. The method utilized magnetic nanoparticles for bacteria enrichment and DNA extraction, resulting in improved DNA yield and quality for enhanced qPCR signal. Evaluation using various gram-negative bacteria showed successful detection and potential application for urinary tract infection diagnosis.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Jiong Cheng, Arunmozhiarasi Armugam, Yang Yang, Fangming Jin, Yugen Zhang, Ning Yan
Summary: This study presents a convenient method for the synthesis of N,N-dimethyl chitosan oligosaccharide (DMCOS) from chitin. The synthesis protocol involves acid-catalyzed tandem depolymerization-deacetylation-N-methylation reactions using formaldehyde as the methylation reagent. The resulting DMCOS exhibits a high degree of deacetylation, a high degree of methylation, and a low average molecular weight, and shows superior antifungal activity against Candida species compared to chitosan.
Article
Chemistry, Physical
Baoqin Wu, Yao Sheng, Linkai Zhou, Runduo Hong, Lifan Zhang, Xinfeng Ren, Xiujing Zou, Xingfu Shang, Xionggang Lu, Xueguang Wang
Summary: The O-methylation of catechol using dimethyl carbonate and APO catalysts was studied for the production of guaiacol. The P/Al molar ratio and catalyst calcination temperature were found to significantly affect the catalytic performance. APO (P/Al = 0.7) showed the highest catalytic activity and stability.
Article
Engineering, Chemical
Jasper van Kampen, Fabienne Lucas, Martin van Sint Annaland
Summary: This study investigates the direct production of dimethyl carbonate (DMC) from CO2 using sorption-enhanced DMC (SEDMC) synthesis. The SEDMC synthesis is shown to be an exemplary case for reactive separation, as it enhances the reaction and simplifies downstream processing. By incorporating in-situ water adsorption, SEDMC achieves significantly higher methanol conversions compared to other direct synthesis routes.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Chemical
Suresh S. Jain, Ganapati D. Yadav
Summary: The study systematically investigated the kinetics and mechanism of ionic liquid catalyzed solvent less liquid-phase O-methylation reaction. The reaction was found to be pseudo zero order with respect to p-cresol and first order with respect to DMC, with the type of cation and anion affecting the catalytic activity of ionic liquids. Tetra butyl phosphonium bromide ionic liquid showed excellent performance in terms of activity, selectivity, reusability, recyclability, and stability.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
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
Thermodynamics
Yuqi Su, Songtao Cao, Taotao Zhan, Maogang He, Ying Zhang
Summary: The mutual diffusion coefficients of dimethyl carbonate + n-heptane and dimethyl carbonate + isooctane binary systems were measured and a theoretical model for these coefficients was developed based on the experimental data.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2022)
Article
Chemistry, Physical
Yongli Pei, Yanhong Quan, Xuhui Wang, Jinxian Zhao, Ruina Shi, Zhong Li, Jun Ren
Summary: Cu/NCNS-x catalysts were fabricated to address deactivation issues in DMC synthesis caused by Cu NPs. The study revealed the mechanism of Cu reconstruction during the reaction process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
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
Energy & Fuels
Qiwei Wang, Jimin Ni, Rong Huang
Summary: This study examines the effects of different oxygenated fuels on engine combustion and emissions performance. It was found that introducing n-octanol improves heat release rate, while ME and DMC decrease it. When it comes to emissions, NO45 has the lowest carbon monoxide emissions, followed by ME13, DMC8, and D100. The use of oxygenated fuels greatly reduces soot emissions.
Article
Chemistry, Applied
Peng Dong, Qingshan Shi, Ruqun Peng, Yingzi Yuan, Xiaobao Xie
Summary: By modifying chitosan oligosaccharide (COS) with the Eschweiler-Clarke reaction, a derivative called DMCOS was synthesized. Analysis revealed that DMCOS had converted primary amines into tertiary amines after methylation. DMCOS showed less thermal stability than COS, but exhibited stronger antimicrobial activity against bacterial and yeast strains, while also displaying lower antioxidant activity and causing mitochondrial damage in C. albicans cells.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Yuen Wai Lui, Bun Chan, Matthew Y. Lui
Summary: Dimethyl sulfide was utilized as an inexpensive and sustainable catalyst for methylations with dimethyl carbonate, resulting in high yields of products with a straightforward workup procedure. Experimental and theoretical methods were used to elucidate the likely mechanisms involving a reactive intermediate.
Article
Chemistry, Physical
Wenjuan Fang, Yaqin Zhang, Zifeng Yang, Zhencai Zhang, Fei Xu, Weiwei Wang, Hongyan He, Yanyan Diao, Yanqiang Zhang, Yunjun Luo
Summary: An efficient synthetic strategy for bio-based polycarbonate was developed using tetramethylammonium-based amino acid ionic liquids as catalysts. By modifying the structure of the catalysts, the conversion of ISB and the molecular weight of PIC could be remarkably improved. The highest catalytic activity was observed with tetramethylammonium arginine due to its multiple active sites and high basicity.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Physics, Condensed Matter
Jun-Qing Wen, Jian-Min Zhang, Ze-Gang Qiu, Xu Yang, Zhi-Qin Li
PHYSICA B-CONDENSED MATTER
(2018)
Article
Chemistry, Multidisciplinary
Zegang Qiu, Kunjie Wang, Zhiqin Li, Tao Li, Jinhao Bai, Chanjuan Yin, Xiushen Ye, Haining Liu
JOURNAL OF CHEMISTRY
(2018)
Article
Chemistry, Physical
Fang Guo, Shaoqing Guo, Xian-Xian Wei, Xiaoxiao Wang, Hongwei Xiang, Zegang Qiu, Liangfu Zhao
Article
Chemistry, Multidisciplinary
Fang Guo, Shaoqing Guo, Zegang Qiu, Liangfu Zhao, Hongwei Xiang
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2014)
Article
Chemistry, Multidisciplinary
Fang Guo, Shaoqing Guo, Xian-Xian Wei, Xiaoxiao Wang, Hongwei Xiang, Zegang Qiu, Liangfu Zhao
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2014)
Article
Chemistry, Physical
Yueling Cao, Liang Ding, Zegang Qiu, Hepeng Zhang
CATALYSIS COMMUNICATIONS
(2020)
Article
Energy & Fuels
Zegang Qiu, Qiao Li, Lei Shi, Zhiqin Li, Liang Ding, Liangfu Zhao
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2020)
Article
Energy & Fuels
Shengguo Zhao, Liang Ding, Yun Ruan, Bin Bai, Zegang Qiu, Zhiqin Li
Summary: The study investigated the gasification characteristics of corn stalk char and the impact of alkali and alkali earth metals on gasification rate, with various models used to describe the gasification behavior. Results showed that the gasification rate of CSC was significantly influenced by steam partial pressure.
Article
Chemistry, Multidisciplinary
Zegang Qiu, Ying Wang, Yali Di, Xiaoxiong Ren, Weiwei Liu, Zhiqin Li, Guangyu Li
Summary: This study presents a 'shortcut' route for the transformation of alkylphenols by co-breaking the C-O and C-C bonds. Experimental results using 4-ethylphenol as a model compound showed high efficiency in achieving the co-breaking of C-O and C-C bonds. The influence of reaction conditions on the conversion rate and selectivity of products was investigated. Theoretical calculations also revealed the importance of the adsorption configuration of the alkylphenol molecule on the catalyst in the bond breaking process.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Zegang Qiu, Yuanzhe Wang, Zhiqin Li, Yueling Cao, Qiao Li
Summary: The study presents a molybdenum carbide (alpha-MoC1-x) catalyst for HDN reactions with high selectivity to aromatic compounds and reduced hydrogen consumption.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Zegang Qiu, Shaobo Ma, Xiaoxia He, Zhiqin Li, Zhenyu Xiong, Yueling Cao, Guangyu Li
Summary: N-doped porous two-dimensional carbon nanosheets were successfully synthesized using graphitic carbon nitride as a template. The resulting nanosheets exhibited high surface area and pore volume, and showed superior catalytic performance compared to traditional microporous carbon-supported catalysts.
Article
Chemistry, Multidisciplinary
Zegang Qiu, Zongxuan Li, Shaobo Ma, Zhiqin Li, Yueling Cao, Guangyu Li
Summary: In this paper, a promising non-noble metal catalyst Co/NPCN for the selective synthesis of cyclohexanols is reported. The catalyst shows excellent catalytic performance and stability with the introduction of an appropriate amount of g-C3N4.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Zegang Qiu, Xiaoxia He, Zhiqin Li, Qichen Guan, Liang Ding, Yanan Zhu, Yueling Cao
Summary: In this study, a promising non-noble Co-Zn/NPC catalyst for the hydrodeoxygenation (HDO) of vanillin was prepared by pyrolysis of Co-Zn zeolite imidazolate framework/graphitic carbon nitride composites. The catalyst showed full vanillin conversion with 99% MMP selectivity, with the presence of g-C3N4 promoting the formation of mesopores benefiting fast mass transfer. The introduction of Zn downsizes the size of Co nanoparticles, lowers the electron density around the Co atoms, and may function as a basic site to enhance the MMP selectivity.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Zegang Qiu, Xiaoxia He, Shaobo Ma, Zhiqin Li, Yu Xiong, Yueling Cao
Summary: This study presents a promising non-noble Ni@CN catalyst for the selective hydrogenation of lignin derivatives. The Ni@CN-425 catalyst exhibits high catalytic performance and stability in converting vanillin to vanillyl alcohol, achieving a vanillin conversion of 99.5% and a vanillyl alcohol selectivity of 98.3% under mild reaction conditions of 80 degrees C.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Fang Guo, Yi-en Du, Xianjun Niu, Shaoqing Guo, Xianxian Wei, Xiaoxiao Wang, Zegang Qiu, Liangfu Zhao
IRANIAN JOURNAL OF CHEMISTRY & CHEMICAL ENGINEERING-INTERNATIONAL ENGLISH EDITION
(2020)
