分散度对负载型铂基催化剂 CO 氧化性能的影响

doi:10.1016/S1872-2067(11)60447-6

催化学报 ›› 2012, Vol. 33 ›› Issue (12): 1901-1905.DOI: 10.1016/S1872-2067(11)60447-6

分散度对负载型铂基催化剂 CO 氧化性能的影响

陈省能, 陈君宇, 赵越, 陈明树*, 万惠霖

厦门大学化学化工学院, 固体表面物理化学国家重点实验室, 醇醚酯化工清洁生产国家工程实验室, 福建厦门 361005

收稿日期:2012-07-06 修回日期:2012-08-22 出版日期:2013-01-18 发布日期:2012-12-18

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

CHEN Xingneng, CHEN Junyu, ZHAO Yue, CHEN Mingshu*, WAN Huilin

Department of Chemistry, College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen University, Xiamen 361005, Fujian, China

Received:2012-07-06 Revised:2012-08-22 Online:2013-01-18 Published:2012-12-18

摘要/Abstract

摘要： 以氧化铈、氧化硅和氧化铝为载体, 采用浸渍法制备了一系列不同负载量的 Pt 基催化剂, 并利用透射电子显微镜、X 射线粉末衍射和 X 射线光电子能谱等技术对催化剂进行了表征. 结果表明, 对于 Pt/CeO2 催化剂, 随着负载量减小, Pt 的分散度提高; 对于相同负载量的 Pt 基催化剂, 各催化剂上 Pt 分散情况为: Pt/SiO₂ < Pt/γ-Al₂O₃ < Pt/CeO₂. CO 氧化反应结果表明, 0.25% Pt/CeO₂ 催化剂表现出更加优良的低温活性, 室温下其单位 Pt 原子上 CO₂ 的生成速率为 2.2 × 10^-3 s^-1.

Abstract: A series of ceria, silica, and γ-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/γ-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 × 10^-³ CO₂ per total Pt per second at room temperature.

Key words: platinum, ceria, silica, alumina, dispersion, carbon monoxide, oxidation

陈省能, 陈君宇, 赵越, 陈明树, 万惠霖. 分散度对负载型铂基催化剂 CO 氧化性能的影响[J]. 催化学报, 2012, 33(12): 1901-1905.

CHEN Sheng-Neng, CHEN Jun-Yu, ZHAO Yue, CHEN Ming-Shu, WAN Hui-Lin. Effect of Dispersion on Catalytic Performance of Supported Pt Catalysts for CO Oxidation[J]. Chinese Journal of Catalysis, 2012, 33(12): 1901-1905.

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分散度对负载型铂基催化剂 CO 氧化性能的影响

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

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