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题名: "Ir-in-ceria": A highly selective catalyst for preferential CO oxidation
作者: Huang, Yanqiang1, 2;  Wang, Aiqin1;  Li, Lin1;  Wang, Xiaodong1;  Su, Dangsheng3;  Zhang, Tao1
关键词: preferential CO oxidation ;  iridium ;  ceria ;  selectivity ;  Ir/CeO2
刊名: JOURNAL OF CATALYSIS
发表日期: 2008-04-25
DOI: 10.1016/j.jcat.2008.01.024
卷: 255, 期:2, 页:144-152
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: An Ir-in-ceria catalyst has been developed, in which most of the iridium particles are embedded in the ceria matrix through the redox reaction between Ce3+ and Ir4+, which occurred during co-precipitation (CP). This Ir-CP catalyst exhibited high activity for preferential CO oxidation under excess hydrogen conditions, and the selectivity to CO2 remained nearly constant, at around 70%, with increasing reaction temperature. Temperature-programmed reduction and in situ diffuse reflectance infrared spectroscopy techniques were used to explore the structure of the Ir-CP catalyst and to correlate it with the catalytic performance. It was found that the CeO2 support was activated by iridium and formed on the surface the active sites for CO oxidation. Due to the absence of extensively exposed Ir species on the Ir-CP catalyst, H-2 oxidation occurring on the Ir species and the ceria support at high temperatures was significantly suppressed, thus keeping the selectivity to CO2 at a high level. (C) 2008 Elsevier Inc. All rights reserved.
关键词[WOS]: WATER-GAS-SHIFT ;  CARBON-MONOXIDE ;  HYDROGEN PROX ;  PT/CEO2 CATALYST ;  SUPPORTED CATALYSTS ;  IRIDIUM CATALYSTS ;  GOLD ;  TEMPERATURE ;  PLATINUM ;  DIOXIDE
语种: 英语
WOS记录号: WOS:000255668200002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141117
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
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

Recommended Citation:
Huang, Yanqiang,Wang, Aiqin,Li, Lin,et al. "Ir-in-ceria": A highly selective catalyst for preferential CO oxidation[J]. JOURNAL OF CATALYSIS,2008,255(2):144-152.
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