A comparison of oxygen-vacancy effect on activity behaviors of carbon dioxide and steam reforming of methane over supported nickel catalysts

被引：110

作者：

Huang, TJ ^{[1
]}

Lin, HJ ^{[1
]}

Yu, TC ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 300, Taiwan

来源：

CATALYSIS LETTERS | 2005年 / 105卷 / 3-4期

关键词：

oxygen vacancy; carbon dioxide reforming; steam reforming; activity behavior; methane; doped ceria; nickel catalyst;

D O I：

10.1007/s10562-005-8697-2

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：

A comparison of the activity behaviors of the mechanistically similar reactions of carbon dioxide reforming and steam reforming of methane was carried out at 450 similar to 500 degrees C over nickel catalysts with samaria- and gadolinia-doped ceria and alpha-alumina as the supports. Results show that the activity behaviors of carbon dioxide reforming and steam reforming of methane are similar and very sensitive to the oxygen-vacancy properties of the support, with a drastic increase of the activities as the temperature increases from 450 to 500 degrees C. Nevertheless, a difference in the activity behaviors between carbon dioxide and steam reforming has been observed and is due to a difference in the reaction mechanisms of CO2 and H2O dissociations. Possible carbon deposition (coking) is lessened due to the reaction of the surface carbon species with the lattice oxygen or the surface O species as produced from CO2 or H2O. It was found that the samaria-doped ceria supported nickel catalyst has better de-coking ability than that of the gadolinia-doped ceria supported one. An oxygen-transport reaction mechanism for doped-ceria supported Ni catalyst has been proposed and shown to explain the activity behaviors successfully.

引用

页码：239 / 247

页数：9

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