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题名: Origin of the high activity of Au/FeOx for low-temperature CO oxidation: Direct evidence for a redox mechanism
作者: Li, Lin1;  Wang, Aiqin1;  Qiao, Botao1;  Lin, Jian1;  Huang, Yanqiang1;  Wang, Xiaodong1;  Zhang, Tao1
关键词: Gold ;  Iron oxide ;  Au/FeOx ;  CO oxidation ;  FT-IR ;  Raman ;  Microcalorimetry ;  Redox
刊名: JOURNAL OF CATALYSIS
发表日期: 2013-03-01
DOI: 10.1016/j.jcat.2012.11.019
卷: 299, 页:90-100
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: 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.
关键词[WOS]: SUPPORTED GOLD CATALYSTS ;  GOLD/IRON-OXIDE CATALYSTS ;  IN-SITU DRIFTS ;  CARBON-MONOXIDE ;  FT-IR ;  AU/TIO2 CATALYST ;  REACTIVE OXYGEN ;  NANOPARTICLES ;  AU ;  CLUSTERS
语种: 英语
WOS记录号: WOS:000316774900009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137855
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Li, Lin,Wang, Aiqin,Qiao, Botao,et al. Origin of the high activity of Au/FeOx for low-temperature CO oxidation: Direct evidence for a redox mechanism[J]. JOURNAL OF CATALYSIS,2013,299:90-100.
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