Research on unsupported nanoporous gold catalyst for CO oxidation

被引：162

作者：

Xu, Caixia ^{[1
]}

Xu, Xiaohong ^{[1
]}

Su, Jixin ^{[1
]}

Ding, Yi ^{[1
]}

机构：

[1] Shandong Univ, Sch Chem & Chem Engn, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2007年 / 252卷 / 02期

基金：

中国国家自然科学基金;

关键词：

CO oxidation; gold catalysts; nanoporous gold; dealloying; support effect;

D O I：

10.1016/j.jcat.2007.09.016

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：

Nanoporous gold (NPG), a novel unsupported gold catalyst prepared by dealloying, exhibits exceptional catalytic activity for CO oxidation. Systematic studies were carried out on this new catalytic system, including the active sites of catalysts, the reaction kinetics, and activity dependence as functions of space velocity and temperature. Our results show strong evidence that metallic gold atoms on NPG are the intrinsic active sites at which the reaction of CO with O-2 occurs. The kinetic study found that the reaction rate of CO oxidation on unsupported NPG depends significantly on CO concentration but only slightly on O-2 concentration. We suggest that CO adsorption plays a decisive role in CO oxidation on NPG as the rate-limiting step. By completely ruling out the support influence, our findings provide considerable insight into the role of gold catalysts. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：243 / 248

页数：6

共 44 条

[1] Oxidation of CO on gold supported catalysts prepared by laser vaporization: Direct evidence of support contribution [J].