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题名: A Highly Active "NiO-on-Au" Surface Architecture for CO Oxidation
作者: Xu, Xuejun1;  Fu, Qiang1;  Guo, Xiaoguang1;  Bao, Xinhe1
关键词: inverse catalysts ;  Au catalysis ;  CO oxidation ;  NiO ;  redox treatment
刊名: ACS CATALYSIS
发表日期: 2013-08-01
DOI: 10.1021/cs400197t
卷: 3, 期:8, 页:1810-1818
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: Supported Au-Ni nanocatalysts consisting of Au nanoparticies decorated with Ni/NiO nanostructures were synthesized using a two-step method and characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. The structural characterization indicates that a small part of surface Ni atoms can diffuse into Au cores upon reduction at 600 degrees C, while the alloyed Ni atoms segregate onto the Au nanoparticle surfaces when oxidizing at a similar temperature. The inward and outward diffusion of Ni atoms at Au surfaces are reversible with response to cycled reduction and oxidation treatments. CO oxidation reactions over the Au-Ni catalysts suggest that Au nanoparticles decorated with highly dispersed NiO nanopatches are the active surface architecture. Optimum activity has been observed by maximizing the density of boundaries between NiO patches and Au surfaces, which can be achieved through suitable redox pretreatments of the Au-Ni catalysts. NiO surface structures in the "NiO-on-Au" inverse catalysts not only enhance Au-catalyzed CO oxidation performance but also prevent sintering of Au nanoparticles at elevated temperatures. Similar high activity for the CO oxidation has been observed in the "CoOx-on-Au" and "FeOx-on-Au" inverse catalysts.
关键词[WOS]: SUPPORTED GOLD CATALYSTS ;  BIMETALLIC CATALYSTS ;  SELECTIVE OXIDATION ;  ALLOY NANOPARTICLES ;  SHELL NANOPARTICLES ;  EFFICIENT CATALYST ;  AU/TIO2 CATALYST ;  FERROUS CENTERS ;  CARBON-MONOXIDE ;  XPS SPECTRA
语种: 英语
WOS记录号: WOS:000322852900017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137700
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:
Xu, Xuejun,Fu, Qiang,Guo, Xiaoguang,et al. A Highly Active "NiO-on-Au" Surface Architecture for CO Oxidation[J]. ACS CATALYSIS,2013,3(8):1810-1818.
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