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Comparative studies of redox behaviors of Pt-Co/SiO2 and Au-Co/SiO2 catalysts and their activities in CO oxidation
Xu, Xuejun1; Fu, Qiang1; Wei, Mingming1; Wu, Xing2; Bao, Xinhe1
刊名CATALYSIS SCIENCE & TECHNOLOGY
2014
DOI10.1039/c4cy00354c
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
关键词[WOS]FISCHER-TROPSCH SYNTHESIS ; BIMETALLIC CATALYSTS ; COBALT OXIDE ; SUPPORTED CATALYSTS ; CO3O4 NANOCRYSTALS ; NANOPARTICLES ; AU ; OXYGEN ; REACTIVITY ; NANOSTRUCTURES
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.
语种英语
WOS记录号WOS:000340208400043
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/145464
专题中国科学院大连化学物理研究所
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
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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.
APA Xu, Xuejun,Fu, Qiang,Wei, Mingming,Wu, Xing,&Bao, Xinhe.(2014).Comparative studies of redox behaviors of Pt-Co/SiO2 and Au-Co/SiO2 catalysts and their activities in CO oxidation.CATALYSIS SCIENCE & TECHNOLOGY,4(9),3151-3158.
MLA Xu, Xuejun,et al."Comparative studies of redox behaviors of Pt-Co/SiO2 and Au-Co/SiO2 catalysts and their activities in CO oxidation".CATALYSIS SCIENCE & TECHNOLOGY 4.9(2014):3151-3158.
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