Effects of Multiple Platinum Species on Catalytic Reactivity Distinguished by Electron Microscopy and X-ray Absorption Spectroscopy Techniques
Nan, B; Hu, XC; Wang, X; Jia, CJ; Ma, C; Li, MX; Si, R
2017
发表期刊JOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
卷号121期号:46页码:25805-25817
文章类型期刊论文
摘要Supported platinum species in the forms of single atoms, ultrafine clusters, and metallic particles have been widely investigated because of their unique catalytic properties in diverse redox reactions. In this work, we used thermally stable ceria-zirconia-lanthana (Ce0.5Zr0.42La0.08Ox as an active oxide support to deposit platinum with different loading amounts from 0.5 to 2 at. % via an incipient wetness impregnation. The as-obtained samples were measured under the methane oxidation reaction conditions with high space velocities up to 100,000 mL.g(-1).h(-1). Here, 1 at. % Pt sample showed the best catalytic performance with a total reaction rate of 1.93 mu mol(CH4).g(cat)(-1).s(-1) w and exclusive platinum rate of 24.4 mmol(CH4).mol(pt)(-1).s(-1) at 450 degrees C. Multiple characterization means, especially aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) with the related profile fittings, were carried out to determine the electronic and local coordination structures of platinum. On the basis of these experimental evidence, we have distinguished the effects of different components and found that platinum oxide clusters (PtxOy) with averaged sizes from subnanometer to 2-3 nm play an essential role for the oxidation of methane. Metallic Pt particles are probably active species, but their large-size characteristics impair the reactivity. However, ionic platinum single atoms may not be appropriate for this catalytic process.
关键词Oxygen Storage Capacity Methane Oxidation Co Oxidation Low-temperature Palladium Nanoparticles Oxide Catalysts Particle-size Noble-metal Single-atom Combustion
DOI10.1021/acs.jpcc.7b07599
关键词[WOS]OXYGEN STORAGE CAPACITY ; METHANE OXIDATION ; CO OXIDATION ; LOW-TEMPERATURE ; PALLADIUM NANOPARTICLES ; OXIDE CATALYSTS ; PARTICLE-SIZE ; NOBLE-METAL ; SINGLE-ATOM ; COMBUSTION
收录类别SCI
语种英语
WOS记录号WOS:000416496200022
引用统计
被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/28635
专题中科院上海应用物理研究所2011-2018年
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Nan, B,Hu, XC,Wang, X,et al. Effects of Multiple Platinum Species on Catalytic Reactivity Distinguished by Electron Microscopy and X-ray Absorption Spectroscopy Techniques[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2017,121(46):25805-25817.
APA Nan, B.,Hu, XC.,Wang, X.,Jia, CJ.,Ma, C.,...&Si, R.(2017).Effects of Multiple Platinum Species on Catalytic Reactivity Distinguished by Electron Microscopy and X-ray Absorption Spectroscopy Techniques.JOURNAL OF PHYSICAL CHEMISTRY C,121(46),25805-25817.
MLA Nan, B,et al."Effects of Multiple Platinum Species on Catalytic Reactivity Distinguished by Electron Microscopy and X-ray Absorption Spectroscopy Techniques".JOURNAL OF PHYSICAL CHEMISTRY C 121.46(2017):25805-25817.
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