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38 results on '"Lv, Yijun"'

29. Synthesis of Stable and Low-CO2Selective Phase-Pure ϵ-Iron Carbide Catalysts in Synthesis Gas Conversion

Author

Wang, Peng, Chen, Wei, Chiang, Fu Kuo, Dugulan, A. Iulian, Zhang, Kui, Chai, Jiachun, Li, Weizhen, Feng, Bo, Lin, Quan, Lv, Yijun, Guo, Zhongshan, Men, Zhuowu, Hensen, Emiel J.M., Qin, Lang, Fan, Liang-Shih, Inorganic Materials & Catalysis, and EIRES Chem. for Sustainable Energy Systems

Subjects
Materials science, Catalysts, business.industry, Iron, Precursors, Context (language use), Chemical synthesis, Catalysis, Carbide, Chemical engineering, Phase (matter), Selectivity, Coal, inorganic carbon compounds, business, Syngas, Bar (unit)
Abstract

The Fe-catalyzed Fischer-Tropsch (FT) synthesis reaction is the core of the coal-to-liquids (CTL) process, which is an efficient route to convert coal into liquid fuels via synthesis gas (a mixture of CO and H2). Conventional Fe-based FT catalysts convert typically 30% of the feed CO to undesirable CO2during the FT step. A decrease of CO2production in FT units can reduce the profitability of the overall CTL process. In this context, we synthesized phase-pure ϵ-Fe-carbide FT catalysts by careful control of the pretreatment and carburization conditions starting from Raney Fe. The resulting phase-pure Fe-carbide exhibits a low CO2selectivity during the Fischer-Tropsch reaction. The developed preparation method can be applied to supported Fe catalysts and does not require expensive starting chemicals. The purity and durability of as-synthesized phase-pure ϵ-Fe-carbide catalyst under FT conditions were characterized in detail by in situ characterization techniques. A bulk phase-pure ϵ-Fe-carbide catalyst operated at 23 bar, 235 °C and a H2/CO ratio of 1.5 shows stable performance with no deactivation during a 150 h pilot test. The catalyst is free of primary CO2formation and presents reduced secondary CO2formation compared to conventional Fe-based FT catalysts. These findings contribute to the development of new Fe-based FT catalysts for CTL processes.

Published
2020

33. Conversion of Methane to C2Hydrocarbons and Hydrogen Using a Gliding Arc Reactor

Author

LV Yijun (吕一军), Yan Wenjuan (闫文娟), Wang Baowei, and HU Shuanghui (胡爽慧)

Subjects
chemistry.chemical_compound, Atmospheric pressure, Hydrogen, Chemistry, Kværner-process, Yield (chemistry), Analytical chemistry, Specific energy, chemistry.chemical_element, Condensed Matter Physics, Product distribution, Methane, Volumetric flow rate
Abstract

Methane conversion has been studied using gliding arc plasma in the presence of argon. The process was conducted at atmospheric pressure and ambient temperature. The focus of this research was to develop a process of converting methane to C2 hydrocarbons and hydrogen. The main parameters, including the CH4/Ar mole ratio, the CH4 flow rate, the input voltage, and the minimum electrode gap, were varied to investigate their effects on methane conversion rate, product distribution, energy consumption, carbon deposit, and reaction stability. The specific energy requirement (SER) was used to express the energy utilization efficiency of the process and provided a practical guidance for optimizing reaction conditions for improving energy efficiency. It was found that the carbon deposition was not conducive to methane conversion, and the gliding arc plasma discharge reached a stable state twelve minutes later. Optimum conditions for methane conversion were suggested. The maximum methane conversion rate of 43.39% was obtained under the optimum conditions. Also, C2 hydrocarbons selectivity, C2 hydrocarbons yield, H2 selectivity, H2 yield and SER were 87.20%, 37.83%, 81.28%, 35.27%, and 2.09 MJ/mol, respectively.

Published
2013

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