Processes
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2021
·Vol. 9
·期 4
·652
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IF 2.847
Huanong Cheng,Na Li,Rui Zhang,Ning Wang,Yuanyuan Yang,Yun Teng,Wenting Jia,Shiqing Zheng
The solubility of hydrogen sulfide in different mole ratios of ferric chloride and 1-butyl-3-methylimidazolium chloride ionic liquid (rFeCl3/[bmim]Cl,r= 0.6, 0.8, 1.0, 1.2, 1.4) at temperatures of 303.15 to 348.15 K and pressures of 100 to 1000 kPa was determined. The total solubility increased with the increase of pressure and the decrease of temperature. The solubility data were fitted using the reaction equilibrium thermodynamic model (RETM). The mean relative error between the predicted value and the measured value was less than 4%. Henry’s coefficient and the equilibrium constant of chemical reaction at each temperature were calculated. Henry’s coefficient first decreased and then increased with the increase of mole ratio, and increased with the increase of temperature. The equilibrium constant of the chemical reaction followed the same law as Henry’s coefficient. The chemical solubility was related to both Henry’s coefficient and the chemical equilibrium constant. H2S had the highest chemical solubility in FeCl3/[bmim]Cl at a mole ratio of 0.6 and a temperature of 333.15 K. The chemical solubility increased with the increase of pressure.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2024
·
IF 3.4
Puhong Yi,Mengdan Liu,Yuhua Hao,Ziwen Wang,Hanlin Liu,Xue Cai,Feng Cheng,Zhiqiang Liu,Yaping Xue,Liqun Jin,Yuguo Zheng
L-phosphinothricin (L-PPT) is the most popular broad-spectrum and highly effective herbicide. Transaminases (TAs) play a pivotal role in asymmetric synthesis of L-PPT, yet encounter the challenge of unfavorable reaction equilibrium. In this study, the novel dual transaminases cascade system (DTCS) was introduced to facilitate the synthesis of L-PPT. The specific amine transaminase BdATA, originating from Bradyrhizobium diazoefficiens ZJY088, was screened and identified. It exhibited remarkable activity, good stability, and required only 2.5 equivalents of isopropylamine to transform pyruvate effectively. By coupling BdATA with previously reported SeTA to construct the DTCS for pyruvate removal in situ , the L-PPT yield escalated from 37.37% to 85.35%. Three advantages of the DTCS were presented: the removal of pyruvate alleviated by-product inhibition, the use of isopropylamine reduced reliance on excess L-alanine, and no demand for expensive cofactors like NAD(P)H. It demonstrated an innovative idea for addressing the challenges associated with transaminase-mediated synthesis of L-PPT.
研究领域:
生物催化
·
酶工程
·
化学生物学
·
药物化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Ying Li,Haibo Zhao
Ethylene production via chemical looping oxidative dehydrogenation (CL-ODH) of ethane faces a critical challenge in balancing conversion efficiency and selectivity due to competing oxygen species requirements. Here, we present a bifunctional composite catalyst (CrH/BiCZ) by physically integrating a Cr-HZSM5 (Cr-H) dehydrogenation (DH) catalyst with a Bi 2 O 3 -Ce 0.4 Zr 0.6 O 2 (Bi-CZ) selective hydrogen combustion (SHC) catalyst. This tandem system decouples ethane activation and hydrogen combustion, promoting the DH process of ethane through the in situ hydrogen combustion of the SHC catalyst. The Ce-Zr solid solution in Bi-CZ acts as an oxygen reservoir, enabling complete H 2 combustion within 3 min and suppressing carbon deposition. This rapid hydrogen combustion shifts the reaction equilibrium towards ethylene production. At 650 °C, the optimized CrH/BiCZ catalyst achieves 84.1 % ethylene selectivity at 43.0 % ethane conversion, and maintains exceptional stability over 36 redox cycles. This work establishes a scalable chemical looping strategy for efficient ethylene synthesis.
研究领域:
催化
·
化学工程
·
材料科学
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反应工程
·
能量转换
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yunhui Xia,Ruixuan Zheng,Bo Wang,Zheng Li,Guohui Cai,Mengjia Zhang,Jianghui Lin,Ling Li
The one-pot synthesis of 3-aryl-2-oxazolidinone from carbon dioxide (CO2), epoxides, and aniline represents a promising strategy for CO2 utilization. However, the efficiency remains far from adequate for industrial deployment, primarily due to the absence of purpose-designed catalysts. Herein, a dual-anion-rich (Br– and OAc–) polymeric ionic liquid (P-TBTOD-1/1/2) was synthesized via copolymerization of vinyl-functionalized ionic liquids (ILs), 1,1,3,3-tetramethylguanidine bromide ([AlTMG]Br), and 1,1,3,3-tetramethylguanidine acetate ([AlTMG]OAc), with divinylbenzene (DVB). The catalytic performance was evaluated for the synthesis of 3-phenyl-2-oxazolidinone from CO2, ethylene oxide (EO), and aniline in a batch autoclave at 2.5 MPa and 110 °C with a catalyst dosage of 4 wt % (based on aniline) for 1.0 h. The aniline conversion was 100%, and the yield of 3-phenyl-2-oxazolidinone was 75%. While Br– could effectively promote the cyclization reaction between CO2 and EO to form ethylene carbonate (EC), its catalytic efficiency in the subsequent conversion of 2-(phenylamino)ethanol and EC to 3-phenyl-2-oxazolidinone was limited. In contrast, OAc– exhibited significantly superior catalytic performance in this reaction. OAc– effectively activated aniline and EO to generate 2-(phenylamino)ethanol. The accumulation of 2-(phenylamino)ethanol and EC in the reaction system synergistically drove the equilibrium toward product formation, thereby significantly enhancing the overall yield of 3-phenyl-2-oxazolidinone. Additionally, P-TBTOD-1/1/2 exhibited outstanding stability, maintaining the yield of 3-phenyl-2-oxazolidinone almost unchanged after five consecutive runs. These findings indicate that P-TBTOD-1/1/2 is a promising candidate catalyst for CO2 utilization.
研究领域:
催化
·
高分子化学
·
绿色化学
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二氧化碳转化
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）