以类水滑石为前体的Ni催化剂及其催化甲烷水蒸气重整制氢:催化活性和动力学(英文)

【摘要】：Ni/Mg–Al catalysts derived from hydrotalcite-type precursors were prepared by a co-precipitation technique and applied to steam reforming of methane. By comparison with Ni/γ-Al2O3 and Ni/α-Al2O3 catalysts prepared by incipient wetness 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/Al molar ratio of 0.5:2.5:1 exhibited the highest activity for steam methane reforming and was 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 CO2were strongly influenced by reaction temperature, residence time of reactants as well as molar 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. 【作者单位】： State
【关键词】： Methane steam reforming Hydrogen Hydrotalcite Catalyst Kinetics
【基金】：Supported by the National Natural Science Foundation of China(21276076) the Program for New Century Excellent Talents in University(NCET-13-0801) the Fundamental Research Funds for the Central Universities(222201313011)
【分类号】：TQ116.2;O643.32
【正文快照】： r t i c l e i n f o a b s t r a c taArticle history:Received in revised form 27 October 2013Accepted 1 November 2013Available online 10 November 2014Ni/Mg–Al catalysts derived from hydrotalcite-type precursors were prepared by a co-precipitation techniq

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