Methane autothermal reforming on nickel-ceria-zirconia based catalysts

被引：56

作者：

Escritori, Janaina C. ^{[1
]}

Dantas, Sandra C. ^{[1
]}

Soares, Ricardo R. ^{[1
]}

Hori, Carla E. ^{[1
]}

机构：

[1] Univ Fed Uberlandia, Fac Engn Quim, BR-38400901 Uberlandia, MG, Brazil

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 07期

关键词：

Methane; Autothermal reforming; Ce0.5Zr0.5O2; Nickel; PARTIAL OXIDATION; NI/CE-ZRO2; CATALYST; SYNTHESIS GAS; ALUMINA; OXIDES;

D O I：

10.1016/j.catcom.2009.01.001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nickel catalysts supported on Ce0.5Zr0.5O2, CeO2/Al2O3, Ce0.5Zr0.5O2/Al2O3, and Al2O3 were investigated for methane autothermal reforming. Samples were characterized by BET area, X-ray diffraction, H-2 temperature programmed reduction and temperature programmed desorption of CO2. Nickel dispersion was evaluated using a model reaction, the dehydrogenation of cyclohexane. Light-off experiments showed that methane autothermal reforming occurred in two steps, by an indirect mechanism: total combustion at lower temperatures followed by methane reforming by CO2 or steam at higher temperatures. Most catalysts exhibited good activity, stability, and a H-2/CO ratio around 2.7 during stability tests that lasted 24 h. 10% Ni/Ce0.5Zr0.5O2/Al2O3 showed the best activity and its performance could be explained by its higher reducibility and Ni dispersion. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：1090 / 1094

页数：5

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