Supported Au catalysts for low-temperature CO oxidation prepared by impregnation

被引：151

作者：

Lee, SJ ^{[1
]}

Gavriilidis, A ^{[1
]}

机构：

[1] UCL, Dept Chem Engn, London WC1E 7JE, England

来源：

JOURNAL OF CATALYSIS | 2002年 / 206卷 / 02期

关键词：

gold catalysts; CO oxidation; impregnation; alumina support;

D O I：

10.1006/jcat.2001.3500

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：

Gold catalysts supported on gamma-Al(2)O(3) powder were prepared by impregnation with solutions of HAuCl(4) which were aged in pH ranging from 5 to 11 for 15-720 min. During aging, hydrolysis of the AuCl(4)(-) complex gave rise to various species as observed by UV/vis Spectroscopy. Au loading and particle size were determined by AAS and XRD. Activity of the catalysts was evaluated at room temperature under stoichiometric as well as excess oxygen concentrations. An particle size and loading were influenced by the precursor speciation, demonstrating that intermediate values of aging pH and time are required for maximum CO conversion. The state of support, wet or dry before impregnation, did not seem to influence catalyst activity, while an excess of oxygen improved conversion. The preparation method was extended to washcoated monoliths and similar high activity was observed. (C) 2002 Elsevier Science (USA).

引用

页码：305 / 313

页数：9

共 34 条

[1] ENHANCEMENT IN THE OPTICAL CO SENSITIVITY OF NIO FILM BY THE DEPOSITION OF ULTRAFINE GOLD PARTICLES [J].