Article
Chemistry, Physical
Chunyu Li, Guiyu Jiang, Hongying Xia, Libo Zhang
Summary: In this study, Cu-Mn doped catalysts were synthesized using SiO2, gamma-Al2O3, and Beta molecular sieve as carriers for the catalytic degradation of propane. The modified H-Cu-Mn-Beta molecular sieve catalyst exhibited large pore size, smooth surface, good adsorption performance, and the highest catalytic degradation effect on propane. The optimized process conditions were determined through single factor tests: Cu: Mn = 2:1, pickling temperature of 50 degrees C, microwave calcination temperature of 500 degrees C, and a holding time of 40 min. The catalyst prepared under these conditions showed high catalytic activity, maintaining a degradation rate above 82.7% within 36 h at a temperature of 500 degrees C.
CATALYSIS COMMUNICATIONS
(2023)
Article
Environmental Sciences
Shixiang Zuo, Xiaoman Cao, Wenjie Liu, Tianhua Liu, Xiazhang Li, Chao Yao, Rong Xu, Yongsheng Fu
Summary: The study focused on utilizing spent bleaching earth to synthesize a 4A zeolite/carbon composite molecular sieve, which showed excellent adsorption and regeneration performance, with a high adsorption capacity for volatile organic compounds such as p-xylene reaching 209.57 mg.g(-1). It was found that the pseudo-first-order rate equation was suitable for describing the adsorption kinetics. The formation mechanism of the composite material was also detailed in the study.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Yadollah Tavan, Fatola Farhadi, Mohammad Shahrokhi
Summary: The study utilized electrochemical oxidative desulfurization technique to reduce the sulfur content of crude diesel, with kinetic study showing a second order reaction rate. Dimethyl sulfoxide was selected as the solvent for desulfurization extraction, with research indicating that low solvent flow rate can improve extraction efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lidong Wang, Lei Xing, Jie Liu, Tieyue Qi, Shihan Zhang, Yongliang Ma, Ping Ning
Summary: In this study, a lattice confined Co-based catalyst was constructed through the in situ growth of Co active sites in MCM-48 molecular sieves to enhance the oxidation of magnesium sulfite. The anchoring of separated Co sites in MCM-48 matrix favored to inhibit the leaching of Co element and promote the generation of (SO5-)-S-center dot radical for the fastened oxidation of MgSO3.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Jinqiang Sun, Jing Zhang, Xiaoqian Peng, Xu Zhang, Zhipeng Yuan, Xiaochan Liu, Sijia Liu, Xinfu Zhao, Shimo Yu, Xibin Yi
Summary: A novel beta molecular sieve/carboxymethyl cellulose/polyvinyl alcohol composite aerogel (beta/CP) is prepared as an efficient gas adsorbent with hierarchical porosity. The synergistic effect between pore structures of different scales improves the adsorption performance, and the CH4 adsorption capacity is comparable to that of the pure beta molecular sieve. The strong interaction between the aerogel and molecular sieve prevents agglomeration and improves pore utilization, making it a promising material for CH4 storage.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Physical
Chao Duan, Chun Tang, Shan Yu, Lina Li, Jinjin Li, Ying Zhou
Summary: Replacing oxygen evolution reaction (OER) with sulfide oxidation reaction (SOR) is a promising technology for decreasing energy consumption in water splitting. However, catalyst stability and passivation issues limit productivity. In this study, an anti-sulfuretted NiSe nanowire array catalyst on nickel foam (NiSe/NF) showed a significantly reduced anode potential and remained stable for over 500 hours without passivation. By converting S2-/HS- to Sn2- and S2O32- instead of sulfur, the long-perplexing passivation issue was avoided. The feasibility of the SOR+HER system in a commercial membrane electrode assembly stack was demonstrated, providing low-cost H2 production by H2S electrooxidation desulfurization.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Minyi She, Rongtian Gu, Deming Meng, Hua Yang, Yujie Wen, Xiaofeng Qian, Xiangke Guo, Weiping Ding
Summary: Nanosheets of nickel doped SAPO-34 molecular sieves with a thickness of around 10 nm were successfully prepared through a morphology-reserved synthesis method. The addition of an appropriate amount of nickel to the synthetic system was found to be crucial for the preservation of the nanosheet morphology. The nickel was confirmed to be doped in the framework of the molecular sieve, which helped balance the high surface energy of the nanosheet products. The resulting NS-Ni-SAPO-34 exhibited excellent catalytic performance for the oxidation reaction of cyclohexanone to adipic acid using gaseous oxygen.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Engineering, Chemical
Mengting Liu, Xuexue Dong, Zengjing Guo, Aihua Yuan, Shuying Gao, Fu Yang
Summary: A synergistic benzene tandem-oxidation catalyst, V-Cu bimetallic oxides modified nanoporous silica (VCu-NS), was constructed for the direct synthesis of benzenediol. The catalyst exhibited excellent catalytic activity and selectivity.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Applied
Ferran Sabate, Jose Luis Jorda, Maria J. Sabater
Summary: In this study, a fraction of structural Mn cations in cryptomelane oxide K-OMS2 were replaced by different cationic dopants, resulting in the weakening of the Mn-O bond and the production of oxygen vacancy defects. The most active catalyst was found to be the ruthenium doped cryptomelane oxide, which exhibited a higher reducibility and a more weakened Mn-O bond force constant value. All the doping processes enhanced the alcohol conversion and showed a high selectivity towards the aldehyde.
Article
Chemistry, Physical
Hua Deng, Yuqin Lu, Tingting Pan, Lian Wang, Changbin Zhang, Hong He
Summary: A novel manganese oxide catalyst was developed by incorporating different metals, showing flexible activity in the removal of various volatile organic compounds. The addition of different metal ions resulted in their uniform dispersion in the catalyst and improved catalytic activity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Analytical
Rui Shi, Yipeng Huang, Yanqun Yang, Zhuqiang Wu, Zhengyi Chen, Guihua Ruan
Summary: A spherical amine-functionalized mesoporous silica molecular sieve was synthesized using an acid hydrothermal method. This molecular sieve exhibited uniform and controllable pore sizes and a large number of amino groups. It was found to be highly efficient in selectively separating aromatic hydrocarbons containing two fused benzene rings from environmental water matrix. The high selectivity was attributed to size sieving and p-pi interactions between amine groups and aromatic hydrocarbons. A solid-phase extraction method coupled with high performance liquid chromatography detection was developed for the analysis of these aromatic hydrocarbons. The study provides inspiration and a reliable method for the separation, removal, and analysis of aromatic hydrocarbons.
MICROCHEMICAL JOURNAL
(2023)
Article
Engineering, Environmental
Jian Li, Jingnan Hu, Yingjie Shi, Jiajia Zhao, Hongchang Wang, Shuang Deng, Yutao Cui, Fan Wang, Hongyan Long, Yuling Tan
Summary: A series of Mn/Cu cosubstituted ZSM-5 catalysts were synthesized and investigated for the catalytic oxidation of hexane. The optimized catalyst, Mn-Cu-HZ(1:1), exhibited excellent catalytic performance due to the presence of superficial lattice oxygens, high transfer capacity, high reducibility, and suitable acidity. Synergistic catalysis between isolated and/or framework Cu2+ and ultrafine MnOx nanoclusters was proposed as the mechanism. This work provides new insights for the design of VOC degradation catalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yu Wang
Summary: This article investigates the kinetic characteristics of pure O2, N2, and Ar in the commercial pressure swing adsorption process at low temperatures. It is found that a combined resistance model of surface barrier and micropore diffusion best describes the behavior of all three gases. The observed kinetic selectivities are well correlated with the difference in activation energies between the gas pairs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Jun Han, Weiwei Shan, Bo Zhao, Yiming Wang, Qiang Zhang, Linbo Qin, Wangsheng Chen
Summary: Cu-doped manganese oxide molecular sieve catalysts were synthesized and their ability to remove Hg0 and resist sulfur was investigated under simulated flue gas conditions. The results showed that appropriate Cu doping increased the active sites and specific surface area of the catalyst, leading to higher Hg0 removal efficiency. The Cu doping also enhanced the adsorption of SO2 and reduced the generation of sulfate, improving the sulfur resistance of the catalyst.
Article
Nanoscience & Nanotechnology
F. Radmanesh, A. Tena, E. J. R. Sudholter, N. E. Benes
Summary: Highly selective and thermally stable thin-film composite membranes for hot hydrogen sieving were prepared using a non-conventional polymerization method. The membranes exhibited excellent hydrogen permselectivity and thermal stability, making them promising for high-temperature industrial gas separations and high-pressure hydrogen storage at ambient temperature.
MATERIALS TODAY NANO
(2023)
