催化学报 ›› 2011, Vol. 32 ›› Issue (8): 1329-1335.DOI: 10.1016/S1872-2067(10)60242-2

• 研究论文 • 上一篇    下一篇

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

王家宁, 戴洪兴, 何洪*   

  1. 北京工业大学环境与能源工程学院化学化工系, 北京 100124
  • 收稿日期:2011-03-22 修回日期:2011-04-26 出版日期:2011-08-05 发布日期:2014-12-26

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

WANG Jianing, DAI Hongxing, HE Hong*   

  1. Chemistry and Chemical Engineering Department, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2011-03-22 Revised:2011-04-26 Online:2011-08-05 Published:2014-12-26

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.

关键词: 铂纳米粒子, 形貌效应, 结构敏感反应, 一氧化碳氧化

Abstract: 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 supported catalysts. CO oxidation was used as the probe to investigate the catalytic activities of these Pt/SiO2 model catalysts. X-ray fluorescence, 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.

Key words: platinum nanoparticle, morphology effect, structure sensitive reaction, carbon monoxide oxidation