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题名: Comparative studies of redox behaviors of Pt-Co/SiO2 and Au-Co/SiO2 catalysts and their activities in CO oxidation
作者: Xu, Xuejun1;  Fu, Qiang1;  Wei, Mingming1;  Wu, Xing2;  Bao, Xinhe1
刊名: CATALYSIS SCIENCE & TECHNOLOGY
发表日期: 2014
DOI: 10.1039/c4cy00354c
卷: 4, 期:9, 页:3151-3158
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Silica supported Pt-Co and Au-Co nanoparticles (NPs) were subjected to various redox processes and characterized by X-ray diffraction, X-ray absorption near edge structure, and X-ray photoelectron spectroscopy. We found that most of the Co oxide (CoOx) species on Pt NPs can be reduced at 100 degrees C forming an alloy structure with Pt at elevated temperatures. Oxidation of Co in the reduced sample takes place gradually with increasing temperatures. In contrast, temperatures higher than 400 degrees C are needed to reduce CoOx on Au NPs and Co atoms hardly form an alloy with Au even at 600 degrees C. The Co species in the reduced Au-Co/SiO2 sample were quickly oxidized in an O-2 atmosphere at room temperature. High CO oxidation activity was observed in the Pt-Co/SiO2 catalyst reduced below 300 degrees C; however this necessitated reduction at 600 degrees C of the Au-Co/SiO2 catalyst. The results illustrate a stronger interaction of Co (CoOx) with Pt than with Au. In both systems, the optimum treatment conditions are to produce a similar CoO-on-noble metal (NM) active structure and maximize the density of interface sites between the surface CoO structure and the NM support.
关键词[WOS]: FISCHER-TROPSCH SYNTHESIS ;  BIMETALLIC CATALYSTS ;  COBALT OXIDE ;  SUPPORTED CATALYSTS ;  CO3O4 NANOCRYSTALS ;  NANOPARTICLES ;  AU ;  OXYGEN ;  REACTIVITY ;  NANOSTRUCTURES
语种: 英语
WOS记录号: WOS:000340208400043
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145464
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.E China Normal Univ, Dept Elect Engn, Shanghai 200241, Peoples R China

Recommended Citation:
Xu, Xuejun,Fu, Qiang,Wei, Mingming,et al. Comparative studies of redox behaviors of Pt-Co/SiO2 and Au-Co/SiO2 catalysts and their activities in CO oxidation[J]. CATALYSIS SCIENCE & TECHNOLOGY,2014,4(9):3151-3158.
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