Low-temperature CO oxidation over Co3O4/Al2O3

被引：263
|
作者：
Jansson, J [1 ]
机构：
[1] Chalmers Univ Technol, Competence Ctr Catalysis, Dept Chem React Engn, S-41296 Gothenburg, Sweden
来源：
JOURNAL OF CATALYSIS | 2000年 / 194卷 / 01期
关键词：
CO oxidation; low temperature; cobalt oxide; isotope-labeled oxygen; reaction mechanism; catalyst pretreatment; deactivation;
D O I：
10.1006/jcat.2000.2924
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：
The oxidation of CO over Co3O4/gamma-Al2O3 at room temperature (21 degrees C) has been studied in a continuous-flow reactor system with oxidising and reducing pretreatment, at varying stoichiometric ratios, and by using isotope-labeled O-18(2), The fresh catalyst was characterised by temperature-programmed reduction and temperature-programmed oxidation. CO deactivates the oxidised catalyst but the rate of deactivation can be suppressed by having a high O-2/CO ratio. The isotope study showed that the oxygen participating in the oxidation of CO comes from oxygen bound to the cobalt oxide surface. Finally, a mechanism for the CO oxidation over Co3O4/gamma-Al2O3 is proposed. (C) 2000 Academic Press.
引用
收藏
页码：55 / 60
页数：6
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