In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

被引：0
|
作者：
Tetsuya Shishido
Hiroyuki Asakura
Fumiaki Amano
Takayoshi Sone
Seiji Yamazoe
Kazuo Kato
Kentaro Teramura
Tsunehiro Tanaka
机构：
[1] Kyoto University,Department of Molecular Engineering, Graduate School of Engineering
[2] Hokkaido University,Catalysis Research Center
[3] Hokkaido University,Graduate School of Environmental Science
[4] Ryukoku University,Department of Materials Chemistry
[5] SPring-8,Japan Synchrotron Radiation Research Institute
[6] Kyoto University,Kyoto University Pioneering Research Unit for Next Generation
来源：
Catalysis Letters | 2009年 / 131卷
关键词：
In situ time-resolved energy-dispersive XAFS; Reduction behavior; Pt; TiO; Al; O;
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摘要：
The dynamic reduction behavior of a highly dispersed Pt4+ to Pt0 particles on TiO2 and Al2O3 surfaces under the reductive atmosphere with an in situ time-resolved energy-dispersive X-ray absorption fine structure (DXAFS) analysis. A highly dispersed Pt4+ on TiO2 was reduced to Pt0 even at room temperature. In contrast, a highly dispersed Pt4+ on Al2O3 was gradually reduced to Pt0 even at 473 K. This result may suggest that the semiconductive behavior of TiO2 promotes the low temperature adsorption of hydrogen and supply of hydrogen atom to Pt4+ to be reduced and the activation of hydrogen on Al2O3 requires high temperature.
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页码：413 / 418
页数：5
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