分散度对负载型铂基催化剂CO氧化性能的影响(英文)  

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

作　　者：陈省能[1] 陈君宇[1] 赵越[1] 陈明树[1] 万惠霖[1] 

机构地区：[1]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

出　　处：《催化学报》2012年第12期1901-1905,共5页

基　　金：supported by the National Basic Research Program of China (973 Program, 2010CB732303);the Key Grant Project of Chinese Ministry of Education (309019);the National Natural Science Foundation of China (20873109, 21033006, 21073149, 20923004);the Program for Changjiang Scholars and Innovative Research Team in University (IRT1036)~~

摘　　要：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2.2×10-3s-1.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.

关 键 词：铂 氧化铈 氧化硅 氧化铝 分散度 一氧化碳 氧化 

分 类 号：O643.36[理学—物理化学]