Origin of the high activity of Au/FeOx for low-temperature CO oxidation: Direct evidence for a redox mechanism

被引：171

作者：

Li, Lin ^{[1
]}

Wang, Aiqin ^{[1
]}

Qiao, Botao ^{[1
]}

Lin, Jian ^{[1
]}

Huang, Yanqiang ^{[1
]}

Wang, Xiaodong ^{[1
]}

Zhang, Tao ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2013年 / 299卷

基金：

中国国家自然科学基金;

关键词：

Gold; Iron oxide; Au/FeOx; CO oxidation; FT-IR; Raman; Microcalorimetry; Redox; SUPPORTED GOLD CATALYSTS; GOLD/IRON-OXIDE CATALYSTS; IN-SITU DRIFTS; CARBON-MONOXIDE; FT-IR; AU/TIO2; CATALYST; REACTIVE OXYGEN; NANOPARTICLES; AU; CLUSTERS;

D O I：

10.1016/j.jcat.2012.11.019

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：

FeOx-supported gold nanocatalyst is one of the most active catalysts for low-temperature CO oxidation. However, the origin of the high activity is still in debate. In this work, using a combination of surface-sensitive in situ FT-IR, Raman spectroscopy, and microcalorimetry, we provide unambiguous evidence that the surface lattice oxygen of the FeOx support participates directly in the low-temperature CO oxidation, and the reaction proceeds mainly through a redox mechanism. Both the presence of gold and the ferrihydrite nature of the FeOx support promote the redox activity greatly. Calcination treatment has a detrimental effect on the redox activity of the Au/FeOx, which in turn decreases greatly the activity for low-temperature CO oxidation. The gold-assisted redox mechanism was also extended to other metal-supported FeOx catalysts, demonstrating the key role of the FeOx support in catalyzing the CO oxidation reaction. (c) 2012 Elsevier Inc. All rights reserved.

引用

页码：90 / 100

页数：11

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