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A Highly Active "NiO-on-Au" Surface Architecture for CO Oxidation
Xu, Xuejun; Fu, Qiang; Guo, Xiaoguang; Bao, Xinhe
关键词Inverse Catalysts Au Catalysis Co Oxidation Nio Redox Treatment
刊名ACS CATALYSIS
2013-08-01
DOI10.1021/cs400197t
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
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
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.
语种英语
WOS记录号WOS:000322852900017
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被引频次:32[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/321008/137700
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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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.
APA Xu, Xuejun,Fu, Qiang,Guo, Xiaoguang,&Bao, Xinhe.(2013).A Highly Active "NiO-on-Au" Surface Architecture for CO Oxidation.ACS CATALYSIS,3(8),1810-1818.
MLA Xu, Xuejun,et al."A Highly Active "NiO-on-Au" Surface Architecture for CO Oxidation".ACS CATALYSIS 3.8(2013):1810-1818.
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