Effect of Dispersion on Catalytic Performance of Supported Pt Catalysts for CO Oxidation

被引：26
作者：
Chen Xingneng [1 ]
Chen Junyu [1 ]
Zhao Yue [1 ]
Chen Mingshu [1 ]
Wan Huilin [1 ]
机构：
[1] Xiamen Univ, Natl Engn Lab Green Chem Prod Alcohols Ethers Est, State Key Lab Phys Chem Solid Surfaces, Dept Chem,Coll Chem & Chem Engn, Xiamen 361005, Fujian, Peoples R China
来源：
CHINESE JOURNAL OF CATALYSIS | 2012年 / 33卷 / 12期
基金：
中国国家自然科学基金;
关键词：
platinum; ceria; silica; alumina; dispersion; carbon monoxide; oxidation; COMBUSTION METHOD; IONIC DISPERSION; CERIA; PLATINUM; PD; BEHAVIOR; CEO2;
D O I：
10.1016/S1872-2067(11)60447-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A series of ceria, silica, and gamma-alumina-supported platinum catalysts were prepared by the incipient-wetness impregnation method. Transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to determine the dispersion of Pt. For the Pt/CeO2 catalysts, XRD studies suggest that Pt was better dispersed as its concentration decreased. This observation correlated well with XPS analysis. For catalysts with the same Pt mass loading, TEM and XRD results suggest that Pt dispersion displays an increasing order as Pt/SiO2 < Pt/gamma-Al2O3 < Pt/CeO2. Catalytic activities for CO oxidation were investigated. Results showed that the 0.25 wt% Pt/CeO2 exhibited a higher activity than other oxide supported catalysts with a turnover frequency of 2.2 x 10(-3) CO2 per total Pt per second at room temperature.
引用
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页码：1901 / 1905
页数：5
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