SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 76-85.DOI: 10.1016/j.cjche.2013.11.002

• 催化、动力学与反应工程 • 上一篇    下一篇

Steam reforming of methane over Ni catalysts prepared from hydrotalcite-type precursors: Catalytic activity and reaction kinetics

Yang Qi, Zhenmin Cheng, Zhiming Zhou   

  1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • 收稿日期:2013-07-24 修回日期:2013-11-01 出版日期:2015-01-28 发布日期:2015-01-24
  • 通讯作者: Zhiming Zhou
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21276076), the Program for New Century Excellent Talents in University (NCET-13-0801) and the Fundamental Research Funds for the Central Universities (222201313011).

Steam reforming of methane over Ni catalysts prepared from hydrotalcite-type precursors: Catalytic activity and reaction kinetics

Yang Qi, Zhenmin Cheng, Zhiming Zhou   

  1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2013-07-24 Revised:2013-11-01 Online:2015-01-28 Published:2015-01-24
  • Contact: Zhiming Zhou
  • Supported by:

    Supported by the National Natural Science Foundation of China (21276076), the Program for New Century Excellent Talents in University (NCET-13-0801) and the Fundamental Research Funds for the Central Universities (222201313011).

摘要: Ni/Mg-Al catalysts derived fromhydrotalcite-type precursorswere prepared by a co-precipitation technique and applied to steamreforming of methane. By comparison with Ni/γ-Al2O3 and Ni/α-Al2O3 catalysts prepared by incipientwetness impregnation, the Ni/Mg-Al catalyst presented much higher activity as a result of higher specific surface area and better Ni dispersion. The Ni/Mg-Al catalyst with a Ni/Mg/Almolar ratio of 0.5:2.5:1 exhibited the highest activity for steam methane reforming andwas selected for kinetic investigation. With external and internal diffusion limitations eliminated, kinetic experiments were carried out at atmospheric pressure and over a temperature range of 823-973 K. The results demonstrated that the overall conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants aswell asmolar ratio of steam to methane. A classical Langmuir-Hinshelwood kinetic model proposed by Xu and Froment (1989) fitted the experimental data with excellent agreement. The estimated adsorption parameters were consistent thermodynamically.

关键词: Methane steam reforming, Hydrogen, Hydrotalcite, Catalyst, Kinetics

Abstract: Ni/Mg-Al catalysts derived fromhydrotalcite-type precursorswere prepared by a co-precipitation technique and applied to steamreforming of methane. By comparison with Ni/γ-Al2O3 and Ni/α-Al2O3 catalysts prepared by incipientwetness impregnation, the Ni/Mg-Al catalyst presented much higher activity as a result of higher specific surface area and better Ni dispersion. The Ni/Mg-Al catalyst with a Ni/Mg/Almolar ratio of 0.5:2.5:1 exhibited the highest activity for steam methane reforming andwas selected for kinetic investigation. With external and internal diffusion limitations eliminated, kinetic experiments were carried out at atmospheric pressure and over a temperature range of 823-973 K. The results demonstrated that the overall conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants aswell asmolar ratio of steam to methane. A classical Langmuir-Hinshelwood kinetic model proposed by Xu and Froment (1989) fitted the experimental data with excellent agreement. The estimated adsorption parameters were consistent thermodynamically.

Key words: Methane steam reforming, Hydrogen, Hydrotalcite, Catalyst, Kinetics