Identification of active gold nanoclusters on iron oxide supports for CO oxidation

被引：1368

作者：

Herzing, Andrew A. ^{[1
,2
]}

Kiely, Christopher J. ^{[1
]}

Carley, Albert F. ^{[3
]}

Landon, Philip ^{[3
]}

Hutchings, Graham J. ^{[3
]}

机构：

[1] Lehigh Univ, Ctr Adv Mat & Nanotechnol, Bethlehem, PA 18015 USA

[2] Natl Inst Stand & Technol, Surface & Microanal Sci Div, Gaithersburg, MD 20899 USA

[3] Cardiff Univ, Cardiff Catalysis Inst Sch Chem, Cardiff CF10 3AT, Wales

来源：

SCIENCE | 2008年 / 321卷 / 5894期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1126/science.1159639

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Gold nanocrystals absorbed on metal oxides have exceptional properties in oxidation catalysis, including the oxidation of carbon monoxide at ambient temperatures, but the identification of the active catalytic gold species among the many present on real catalysts is challenging. We have used aberration- corrected scanning transmission electron microscopy to analyze several iron oxide- supported catalyst samples, ranging from those with little or no activity to others with high activities. High catalytic activity for carbon monoxide oxidation is correlated with the presence of bilayer clusters that are similar to 0.5 nanometer in diameter and contain only similar to 10 gold atoms. The activity of these bilayer clusters is consistent with that demonstrated previously with the use of model catalyst systems.

引用

页码：1331 / 1335

页数：5

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