Deactivation of nanosize gold supported on zirconia in CO oxidation

被引：71

作者：

Konova, P

Naydenov, A

Tabakova, T

Mehandjiev, D

机构：

[1] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

[2] Bulgarian Acad Sci, Inst Catalysis, BU-1113 Sofia, Bulgaria

来源：

CATALYSIS COMMUNICATIONS | 2004年 / 5卷 / 09期

关键词：

gold supported oxide catalysts; Au/ZrO2; CO oxidation; mechanism; deactivation;

D O I：

10.1016/j.catcom.2004.06.010

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：

An Au/ZrO2 catalyst containing nanosize gold was investigated with respect to its activity in CO oxidation. The high initial activity observed at temperatures down to 230 K was followed by a gradual decrease. Two main reasons for the catalyst deactivation were found: (i) adsorption of CO and its accumulation as carbonates, this deactivation being reversible and after heating the catalyst surface being restored by CO2 evolution, (ii) agglomeration of Au particles, which causes irreversible however weak deactivation. IR, XPS and TPD data were provided in support of a probable model of CO oxidation and deactivation on Au/ZrO2 catalyst. (C) 2004 Elsevier B.V. All rights reserved.

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收藏

页码：537 / 542

页数：6

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