Mechanism of CO oxidation over CuO/CeO2 catalysts

被引：49
|
作者：
Moreno, Maiximo [1 ]
Bergamini, Lorena [1 ]
Baronetti, Graciela T. [1 ]
Laborde, Miguel A. [1 ]
Marino, Fernando J. [1 ]
机构：
[1] Univ Buenos Aires, DIQ FI, Lab Proc Catalit, RA-1428 Buenos Aires, DF, Argentina
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 11期
关键词：
Mechanism; Kinetics; Cu; Ce; CO oxidation; Hydrogen; OXIDE COMPOSITE CATALYSTS; CARBON-MONOXIDE; PREFERENTIAL OXIDATION; SELECTIVE OXIDATION; CUO-CEO2; CATALYSTS; RICH H-2; HYDROGEN; KINETICS; EXCESS; FUEL;
D O I：
10.1016/j.ijhydene.2009.12.107
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 mechanistic study of the CO oxidation reaction over copper-cerium catalysts was performed based on our own results and information available in literature. The fit of parameters was carried out with kinetic information obtained ad-hoc. Two possible mechanisms whose main difference is the role of copper were proposed. The first one postulates changes in the oxidation state of both cations (cerium and copper) while, in the second mechanism, it was assumed that the redox cycle only occurs for the ceria component. The results allow to conclude that the catalytic cycle involves both redox couples (Ce4+/Ce3+ and Cu2+/Cu1+). The kinetic expression derived from this mechanism consists of five constants and is able to accurately predict the behavior of the reactor in different reaction conditions. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：5918 / 5924
页数：7
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