高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (10): 2032.

• 研究论文 • 上一篇    下一篇

Pt/CeO2/SBA-15催化剂上Pt-CeO2接触界面的相互作用

毕亚东, 张微, 徐恒泳, 李文钊   

  1. 中国科学院大连化学物理研究所应用催化研究室, 大连 116023
  • 收稿日期:2008-12-05 出版日期:2009-10-10 发布日期:2009-10-10
  • 通讯作者: 徐恒泳, 男, 研究员, 博士生导师, 主要从事多相催化、氢能及膜分离研究. E-mail: xuhy@dicp.ac.cn
  • 基金资助:

    国家“九七三”计划(批准号: 2005CB221401)资助.

Interaction at Pt-CeO2 Contact Interface over Pt/CeO2/SBA-15 Catalyst

BI Ya-Dong, ZHANG Wei, XU Heng-Yong*, LI Wen-Zhao   

  1. Applied Catalysis Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2008-12-05 Online:2009-10-10 Published:2009-10-10
  • Contact: XU Heng-Yong. E-mail: xuhy@dicp.ac.cn
  • Supported by:

    国家“九七三”计划(批准号: 2005CB221401)资助.

摘要:

通过沉积沉淀法(Deposition precipitation, DP)将CeO2纳米粒子高度分散在SBA-15分子筛上, 进一步采用浸渍法负载Pt后制备了 Pt/CeO2/SBA-DP催化剂. 紫外-可见漫反射光谱分析表明, 在Pt/CeO2/SBA-DP催化剂上可以形成更多的Pt-CeO2接触界面, 有利于从CeO2到Pt的电子转移过程. CO程序升温还原(CO-TPR)测试证实, Pt/CeO2/SBA-DP催化剂上CeO2表面氧物种具有较高的还原能力.

关键词: 氧化铈; SBA-15分子筛; 铂; 紫外-可见漫反射光谱; CO程序升温还原

Abstract:

A high dispersion of CeO2 within the pores of an SBA-15 mesoporous silica was achieved via deposition precipitation(DP) method, and Pt/CeO2/SBA-15 catalyst was prepared by further depositing Pt on CeO2-modified SBA-15. UV-Vis diffuse reflectance spectra show that intimate contact is formed at Pt-CeO2 interface, which is in favor of the transfer of electrons from CeO2 to Pt and formation of oxygen vacancies. The CO temperature-programmed reduction(CO-TPR) verified the enhanced reducibility of the surface oxygen on CeO2 over Pt/CeO2/SBA-15-DP catalyst.

Key words: CeO2; SBA-15 molecular sieve; Pt; UV-Vis diffuse reflectance spectrum; CO temperature-programmed reduction

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