负载型Pt模型催化剂中Pt纳米粒子的形貌对CO氧化活性的影响(英文)  

Effect of the Morphology of Pt Nanoparticles of Supported Pt Model Catalysts on CO Oxidation

作　　者：王家宁[1] 戴洪兴[1] 何洪[1] 

机构地区：[1]北京工业大学环境与能源工程学院化学化工系,北京100124

出　　处：《催化学报》2011年第8期1329-1335,共7页

基　　金：supported by the National Natural Science Foundation of China(20877006and20833011);Natural Science Foundation of Beijing Municipality(2101002)~~

摘　　要：采用简单的化学还原法制备了具有不同形貌特征的Pt纳米粒子,并利用浸渍法将其负载到SiO2上,得到了粒子分散均一的负载型Pt催化剂,考察了其催化CO氧化反应性能.X射线荧光分析、X射线光电子能谱、红外光谱和透射电镜结果表明,Pt/SiO2模型催化剂上CO氧化活性的不同来源于Pt纳米粒子不同晶面的贡献,即Pt纳米粒子的晶型对CO在催化剂上的吸附和Pt/SiO2的CO氧化活性具有重要的影响.In order to investigate the influence of particle morphology on the catalytic activity of supported Pt model catalyst,platinum nanoparticles（NPs）with different morphologies were synthesized by a chemical method and loaded onto SiO2 to give well-defined sup-ported catalysts.CO oxidation was used as the probe to investigate the catalytic activities of these Pt/SiO2 model catalysts.X-ray fluores-cence,X-ray photoelectron spectroscopy,diffuse reflectance Fourier transform infrared spectroscopy,and transmission electron microscopy characterization demonstrated that the different activities of these Pt/SiO2 catalysts were due to different crystal surfaces,which strongly influenced the adsorption and oxidation of CO on the Pt NPs.

关 键 词：铂纳米粒子 形貌效应 结构敏感反应 一氧化碳氧化 

分 类 号：O643.36[理学—物理化学]