JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Qingshan Liu,Liwei Zhao,Qige Zheng,Lin Mou,Pengfei Zhang
Two hydrophobic ionic liquids (ILs) 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C2mim][NTf2] and [C4mim][NTf2]) were synthesized. The binary mixtures of the two ILs were prepared with dimethyl carbonate (DMC) or diethyl carbonate (DEC) over the entire mole fraction range, respectively. The density and viscosity of the binary mixtures were determined by an automated DMA 5000 M and a Lovis 2000 ME Anton Paar Rotational Stabinger Viscometer at temperatures ranging from 288.15 to 328.15 K. The uncertainties of the density and viscosity are ur(ρ) = 0.00120 and ur(η) = 0.01. The excess molar volumes and viscosity deviations were calculated for the four binary mixtures by the measurement values. The effects of the extension of the alkyl chain of the cation and anion on the above properties are discussed. The effects of the methyl introduction on the cation was also discussed with the literature. The excess molar volumes and viscosity deviations were fitted versus mole fraction according to the Redlich–Kister equation. The thermal expansion coefficients of the systems were calculated according to the density values.
研究领域:
物理化学
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材料科学
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2026
·Vol. 49
·期 4
·e70205
·
IF 2
Yu-Qing Li,Yuwei Wang,Fei Wang,Hong Chen,Shenghao Yang,Lihong Zhao,Xu Liang,Yuanli Jiang,Feidong Xie,Liutao Hou,Zhenfeng Liu,Jiantang Sun
A structured, chloride-free Pd–Cu/NaY catalyst was developed for the direct synthesis of dimethyl carbonate (DMC) from syngas-derived methyl nitrite and CO. The NaY zeolite support stabilizes Pd(II) species via strong electrostatic interactions, while Cu addition enhances durability by suppressing Pd reduction and aggregation, as confirmed by H 2 -TPR and TEM. Using shaped spherical supports improves DMC selectivity by limiting methyl nitrite decomposition side reactions through diffusion constraints. Under optimized conditions (CO/MN = 1/6, 120°C), the catalyst achieves a DMC space-time yield of 669 g·kg −1 ·h −1 with high selectivity. A 1000 h stability test shows sustained activity above 550 g·kg −1 ·h −1 after an initial run-in period. In situ DRIFTS studies identify the ligand exchange step as rate-determining and elucidate the full reaction pathway. This robust catalytic system demonstrates strong potential for pilot-scale and industrial syngas-to-DMC processes.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yueyue Sun,Chaoqi Zhu,Chaofan Ma,Jiahong Tang,Dawen Zeng
SnO 2 hollow nanospheres sensor was synthesized for DMC detection. • The sensor shows ultra-high response (80.1) to 10 ppm DMC at 120 °C. • LIB leakage simulation tests confirmed the feasibility of real time leak monitoring. • Performance is enhanced by unique hollow morphology and surface oxygen vacancies. The leakage of the electrolyte solution (DMC) in lithium-ion batteries (LIBs) is an early sign of thermal runaway. Therefore, early detection of this phenomenon is of vital importance for safety monitoring. In this work, hollow-structured SnO 2 nanospheres were synthesized via a facile hydrothermal method as a sensing material for DMC detection. The material was comprehensively characterized by XRD, FESEM, TEM, XPS, and BET analysis, confirming its unique hollow spherical morphology, high specific surface area, and abundant surface oxygen vacancies. Gas sensing evaluations demonstrated that the sensor based on this material exhibited outstanding performance at a relatively low optimal operating temperature of 120 °C, including a high response of 80.1 toward 10 ppm DMC, a fast response time of 16 s, excellent selectivity against common interfering gases, and remarkable long-term stability. The enhanced performance is attributed to the synergistic effects of the hollow structure and surface chemistry, which facilitate gas diffusion and surface reactions. This work provides a promising strategy for developing high-performance, low-cost metal oxide semiconductor gas sensors for early safety warning in LIB systems. Download: Download high-res image (157KB) Download: Download full-size image
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Ge Yuru,Li Yushu,Zu Baiyi,Zhou Chaoyu,Dou Xincun
Complex multiphase waste system purification, as one of the major challenges in many industrial fields, urgently needs an efficient one-step purification method to remove several pollutants simultaneously and efficiently. Multi-functionalized magnetic nanoparticles, Fe 3 O 4 @SiO 2 -MPS-AM-DMC-AMPS, were facilely prepared via a one-pot in situ polymerization of three different functional monomers, AM, DMC, and AMPS, on a Fe 3 O 4 @SiO 2 -MPS core-shell structure. The multi-functionalized magnetic nanoparticles (MNPs) are proven to be a highly effective purification agent for oilfield wastewater, an ideal example of industrial complex multiphase waste system containing cations, anions, and organic pollutants. Excellent overall removal efficiencies for both cations, including K + , Ca 2+ , Na + , and Mg 2+ of 80.68 %, and anions, namely Cl − and SO 4
2− , of 85.18 % along with oil of 97.4 % were shown. The high removal efficiencies are attributed to the effective binding of the functional groups from the selected monomers with cations, anions, and oil emulsions.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Ping An,Jian Shi,Yuxin Wang,Zizhen Yan,Jiaxiang Hou,Guangwen Xu,Haiming Yu,Lei Shi
Various strongly basic ionic liquids with distinctive structures, including single and double ended quaternary ammonium and phosphorus salts, were first synthesized based on hydroxyethoxy anion (HOCH 2 CH 2 O – ) from the product ethylene glycol . Nature was characterized by NMR, FTIR, TG and acid-base titration. Its alkali strength was equivalent to that of sodium methoxide, demonstrating superior alkalinity. Influences of cation structures and C 1 -C 4 alcohols structures on transesterification efficiency were investigated. Under mild conditions (68 °C for 5 min), DMC yield was 42.8% with a TOF value of 2853.6 h −1 when [TBAB]OCH 2 CH 2 OH as catalyst with only 0.18% EC molar content, indicating good catalytic performance. Comparison was made for reaction results between the synthesized catalysts and reported catalysts in literatures. The reaction mechanism was further deduced. Activation energies of positive and reverse reactions were determined as Ea + =32.0 kJ·mol −1 and Ea - =15.3 kJ·mol −1 through kinetics calculation. Relying on its decomposability and recyclability of decomposition products, a new catalyst circulation process without introducing any impurities was proposed and verified.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9842-9851
·
IF 3.3
Li Luo,Jie Deng,Yingying Wang,Qiang Tang,Mengyue Hou,Ziyue Zhang,Shijian Lu,Yongdong Chen
Developing efficient catalysts is crucial for the chemical utilization of CO2, which would be conducive to solving both environmental issues and the resource crisis. In this work, a basalt fiber (BF)-supported CuNi catalyst was constructed for the conversion of CO2 and methanol to dimethyl carbonate (DMC). In order to optimize the surface properties of BF, the pristine BF (BF-U) was modified by HCl (BF-H) and NaOH (BF-N) solutions. The influence of the BF surface properties on the physicochemical state of CuNi and the catalytic performance of the supported CuNi/BF catalysts was systematically investigated. The results showed that the CuNi/BF-N monolithic catalyst had the best activity, and the yield of DMC reached 12.9%. SEM, XRD, and XPS characterizations exhibited that the CuNi nanoalloy particles were uniformly distributed on BF-N and possessed high Cu0/1+ and Ni0 contents. This contributed to the abundant CO2 adsorption sites, as evidenced by CO2-TPD, especially for the medium-strength CO2 adsorption sites, which was responsible for the superior catalytic activity. This study provides an efficient catalyst for the synthesis of DMC from CO2 and methanol and can serve as a reference for industrial catalyst design.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2026
·
IF 8.3
Chaoqi Zhu,Yazhou Yang,Huajing Wang,Chaofan Ma,Baisheng Sa,Rui Xiong,Wulin Song,Dawen Zeng
The safety issues caused by the leakage of lithium-ion batteries (LIBs) electrolyte have attracted growing attention. Due to the volatile, flammable, and explosive nature, even minor electrolyte leakage can lead to serious safety risks. Real-time detection of dimethyl carbonate (DMC), a primary electrolyte component, is essential for preventing LIB-related accidents. This study presents a gas sensor based on Sr-doped LaFeO 3 hollow microspheres for DMC detection. Sr doping introduces additional oxygen vacancies, leading to a significant enhancement in sensor performance. The LaFeO 3 -Sr-5 sensor with a Sr doping concentration of 5 at% exhibited the best performance, including a high response value (∼53.9–1 ppm DMC), excellent sensitivity (obvious response to 10 ppb DMC), outstanding selectivity, and good stability at an operating temperature of 110℃. Density functional theory (DFT) calculations confirmed that the adsorption capacity of DMC on the surface of LaFeO 3 material was significantly increased after Sr 2 + doping. In simulated LIB electrolyte leakage scenarios, the sensor shows rapid and distinct responses, demonstrating its potential for practical application in battery safety monitoring.
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RSC Advances
·
2018
·Vol. 8
·期 61
·35014-35022
·
IF 2.936
Menglu Song,Xiangui Yang,Gongying Wang
γ-Al2O3 loaded with potassium nitrate (KNO3/Al2O3) catalysts were prepared, characterized and employed as a type of heterogenous solid base catalyst in the synthesis of polycarbonate (1,4-butane carbonate)-diol (PBC–OH) via the transesterification of dimethyl carbonate (DMC) and 1,4-butanediol (BD). The relationship between physicochemical properties and catalytic performance for KNO3/Al2O3 in this transesterification reaction was investigated using various techniques. The results demonstrated that the performance of KNO3/Al2O3 catalysts was highly influenced by basic site amount and strength. The medium and strong basic sites were beneficial for this reaction. The catalyst with a KNO3 loading of 35% and a calcination temperature of 700 °C exhibited the best catalytic activity due to its highest basic site amount and appropriate base strength. The highest BD conversion and PBC–OH yield of 80.2% and 68.4% were obtained under optimal reaction conditions. Also, this solid base catalyst was successfully employed in the synthesis of copolycarbonate diols from DMC and two different diols. Different scanning calorimetry results indicated that the thermal properties of the copolycarbonate diols can be adjusted by regulating the average segment lengths, Mn and copolymer composition structure.
研究领域:
化学工程
·
材料科学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Daoyun Zhu,Haiou Liu,Yangqiang Huang,Xiao Luo,Yu Mao,Zhiwu Liang
Rare earth metal oxides are known to have good catalytic effectiveness in the direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol. In this work, we screened ceria (CeO2) catalysts by analyzing their capacity for CO2 adsorption. The effects of the crystal surface morphology and oxygen vacancy on the catalytic performance of the ceria catalyst were studied by using density functional theory (DFT). The results show that the (110) surface and higher oxygen vacancy content can better promote the synthesis of DMC and that the rod-shaped CeO2 catalyst has a better catalytic effect. The oxygen vacancy content on the catalyst was improved by freeze-drying and confirmed by thermogravimetric analysis, Raman spectroscopy, and electron paramagnetic resonance. The freeze-dried CeO2 (CeO2-FD) then showed a higher catalytic performance. The conversion rate of methanol and the yield of DMC were 33.95% and 584 mmol g–1cat, respectively, under mild conditions (140 °C and 1 MPa).
研究领域:
催化化学
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理论计算
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材料科学
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.042
Siqi Wang,Xiaoyu Guo,Shuang Guan,Hai Fu,Xiufeng Wang,Peipei Guo
It is still challenging to prepare high strength hydrogels which can self-heal in both alkali and acid solutions. In this work, 6-acrylamidohexanoic acid (AACA) and [2-(methacryloyloxy)ethyl]trimethylammonium chloride solution (DMC) monomers were copolymerized in a mixture solution of polyvinyl alcohol (PVA) and borax to prepare high strength and pH responsive hydrogel. Compared with borax cross-linked PVA gel, this hydrogel exhibits better mechanical properties owing to multi-physical interactions like electrostatic interactions and hydrogen bonds. Due to the presence of noncovalent interactions the hydrogel exhibits different degrees of self-healing ability in acid and alkali at the same time. Furthermore, the conductivity of the hydrogel can be significantly change with slight deformation, which can be used to monitor the body movement like swallow and finger bending.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
CATALYSIS TODAY
·
2023
·
IF 5.3
Wensheng Wei,Yuxin Wang,Zizhen Yan,Jiaxiang Hou,Guangwen Xu,Lei Shi
Three quaternary ammonium ionic liquids with strong nucleophilicity and distinctive structures were synthesized with high yield and purity based on the 1,2-propylene glycol anion (CH 3 CH 2 OHCH 2 O - ) derived from transesterification products. Dimethyl carbonate (DMC) was in turn produced via a one-step reaction among propylene oxide (PO), CO 2 , and methanol (MeOH) by using the synthesized ionic liquids. The involved two-stage catalytic reaction of PO-CO 2 cycloaddition and PC-MeOH transesterification was implemented without catalyst separation. Under mild conditions, the PO conversion reached 99.0%, with a PC yield of 99.0%, and a TON value of 119.5. Following the cycloaddition, MeOH was immediately introduced to achieve a PC conversion of 71.2%, a selectivity to DMC above 99%, and a TON value of 57.4 for the transesterification reaction. The influences of temperature as well as time for cycloaddition and transesterification were investigated. Cycloaddition of CO 2 with various epoxides was also examined and all showed good performance. By taking advantage of the decomposability of as-prepared ionic liquids and the recyclability of decomposition products, a new catalyst circulation process was designed to complete the full cycle without introduction of any impurities into the product system.
研究领域:
化学工程
·
环境科学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 27
·12934-12940
·
IF 3.925
Hansen Yang,Zhimiao Wang,Hualiang An,Qiusheng Yang,Wei Xue,Fang Li,Yanji Wang
Theobromine is an important pharmaceutical intermediate and food additive. We have developed a green method for theobromine synthesis, namely catalyst-free methylation of 3-methylxanthine with dimethyl carbonate (DMC). The effects of various solvents on the reaction were investigated; H2O was found to be the most appropriate solvent. The bond energies of C–O in DMC and N–H in 3-methylxanthine were calculated at the M06-2x/6-311G(d,p) level, and the role of the solvent was examined theoretically. The use of H2O as the solvent and the effects of DMC hydrolysis on the reaction were investigated. The results show that DMC hydrolysis was, to some extent, beneficial to theobromine synthesis. The reaction conditions were optimized. When the molar ratio of DMC to 3-methylxanthine was 11 : 1 and the 3-methylxanthine dosage was 0.1 g per mL-H2O, reaction at 160 °C for 9 h gave a 3-methylxanthine conversion of 89.9% with 98.2% theobromine selectivity.
研究领域:
药物化学
·
绿色化学
·
有机合成
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DOI
高影响因子
危险品化学品经营许可证（带存储）