| 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) |
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| 引用本文： | 祁阳,程振民,周志明.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)[J].中国化学工程学报,2015,23(1):76-85. |
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| 作者姓名： | 祁阳 程振民 周志明 |
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| 作者单位： | State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| 基金项目： | 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) |
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| 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 in-cipient 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 inter-nal 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 overal conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants as wel 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 thermodynamical y.
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| 关 键 词： | Methane steam reforming Hydrogen Hydrotalcite Catalyst Kinetics |
| 收稿时间： | 2013-07-24 |
Steam reforming of methane over Ni catalysts prepared from hydrotalcite-type precursors:Catalytic activity and reaction kinetics |
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| Yang Qi;Zhenmin Cheng;Zhiming Zhou.Steam reforming of methane over Ni catalysts prepared from hydrotalcite-type precursors:Catalytic activity and reaction kinetics[J].Chinese Journal of Chemical Engineering,2015,23(1):76-85. |
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| Authors: | Yang Qi;Zhenmin Cheng;Zhiming Zhou |
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| Affiliation: | State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | 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 in-cipient 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 inter-nal 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 overal conversion of CH4 and the conversion of CH4 to CO2 were strongly influenced by reaction temperature, residence time of reactants as wel 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 thermodynamical y. |
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| Keywords: | Methane steam reforming Hydrogen Hydrotalcite Catalyst Kinetics |
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