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

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• 作者：Xingneng CHEN ; Junyu CHEN ; Yue ZHAO ; Mingshu CHEN ; ^{chenms@xmu.edu.cn} ; Huilin WAN
• 关键词：platinum ; ceria ; silica ; alumina ; dispersion ; carbon monoxide ; oxidation
• 刊名：Chinese Journal of Catalysis
• 出版年：2012
• 出版时间：November-December, 2012
• 年：2012
• 卷：33
• 期：11-12
• 页码：1901-1905
• 全文大小：944 K

文摘

A series of ceria, silica, and ¦Ã-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/¦Ã-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 ¡Á 10^?3 CO₂ per total Pt per second at room temperature.