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题名: Design of a novel bifunctional catalyst IrFe/Al2O3 for preferential CO oxidation
作者: Zhang, Wansheng1, 2;  Wang, Aiqin1;  Li, Lin1;  Wang, Xiaodong1;  Zhang, Tao1
通讯作者: 张涛
关键词: CO oxidation ;  PROX ;  Ir-Fe catalyst ;  iridium ;  microcalorimetry
刊名: CATALYSIS TODAY
发表日期: 2008-02-29
DOI: 10.1016/j.cattod.2007.10.058
卷: 131, 期:1-4, 页:457-463
收录类别: ISTP ;  SCI
文章类型: Article
部门归属: 15
项目归属: 1501
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: In this study, a novel bifunctional catalyst IrFe/Al2O3, which is very active and selective for preferential oxidation of CO under H-2-rich atmosphere, has been developed. When the molar ratio of Fe/Ir was 5/1, the IrFe/Al2O3 catalyst performed best, with CO conversion of 68% and oxygen selectivity towards CO2 formation of 86.8% attained at 100 degrees C. It has also been found that the impregnation sequence of Ir and Fe species on the Al2O3 support had a remarkable effect on the catalytic performance; the activity decreased following the order of IrFe/Al2O3 > co-IrFe/ Al2O3 > Fefr/Al2O3. The three catalysts were characterized by XRD, H-2-TPR, FT-IR and microcalorimetry. The results demonstrated that when Ir was supported on the pre-formed Fe/Al2O3, the resulting structure (IrFe/Al2O3) allowed more metallic Ir sites exposed on the surface and accessible for CO adsorption, while did not interfere with the O-2 activation on the FeOx species. Thus, a bifunctional catalytic mechanism has been proposed where CO adsorbed on Ir sites and O-2 adsorbed on FeOx sites; the reaction may take place at the interface of Ir and FeOx or via a spill-over process. (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: CARBON-SUPPORTED CATALYSTS ;  FUEL-CELL APPLICATIONS ;  H-2-RICH GAS STREAMS ;  SELECTIVE OXIDATION ;  LOW-TEMPERATURE ;  METAL-CATALYSTS ;  MONOXIDE ;  SURFACE ;  H-2 ;  FE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000253382100064
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/100067
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 Sch, Beijing 100049, Peoples R China

Recommended Citation:
Zhang, Wansheng,Wang, Aiqin,Li, Lin,et al. Design of a novel bifunctional catalyst IrFe/Al2O3 for preferential CO oxidation[J]. CATALYSIS TODAY,2008,131(1-4):457-463.
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