高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (7): 1467-1474.doi: 10.7503/cjcu20180194

• 物理化学 • 上一篇    下一篇

钾促进的Pt/TiO2催化一氧化碳氧化

刘敬华, 丁彤, 田野(), 李新刚()   

  1. 天津化学化工协同创新中心, 天津市应用催化科学与工程重点实验室,天津大学化工学院, 天津 300354
  • 收稿日期:2018-03-12 出版日期:2018-07-10 发布日期:2018-06-13
  • 作者简介:联系人简介: 李新刚, 男, 博士, 教授, 主要从事环境催化方面的研究. E-mail: xingang_li@tju.edu.cn; 田 野, 男, 博士, 讲师, 主要从事环境催化方面的研究. E-mail: tianye@tju.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: U1232118, 21476159)资助.

Enhanced CO Oxidation Performance over Potassium-promoted Pt/TiO2 Catalysts

LIU Jinghua, DING Tong, TIAN Ye*(), LI Xingang*()   

  1. Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin Key Laboratory of Applied Catalysis Science & Engineering,School of Chemical Engineering & Technology,Tianjin University, Tianjin 300354, China
  • Received:2018-03-12 Online:2018-07-10 Published:2018-06-13
  • Contact: TIAN Ye,LI Xingang E-mail:tianye@tju.edu.cn;xingang_li@tju.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.U1232118, 21476159).

摘要:

采用水热法制备了TiO2载体, 将其浸渍Pt和不同含量的碱金属助剂K, 再进行氢化得到K-Pt/TiO2催化剂; 并将该催化剂用于催化一氧化碳氧化反应. 实验结果表明, 当K负载量(质量分数)为0.3%时催化剂表现出最佳的催化性能. X射线光电子能谱和储氧能力测试结果表明, 碱金属助催化剂K能促进氧空位的生成, 增加活性氧物种. 适量K的加入能提高Pt的分散度, 并提高催化剂催化CO氧化的活性.

关键词: 一氧化碳氧化, 碱金属助剂钾, 氧空位, Pt的分散度

Abstract:

We prepared TiO2 support by hydrothermal method and impregnated Pt and different amounts of alkali metal promotor potassium on the support to obtain the precursors. The K-Pt/TiO2 catalysts were prepared by hydrogenating and used for catalytic oxidation of CO. The catalyst with a potassium content of 0.3%(mass fraction) exhibited the best catalytic performance among all the catalysts. The results of X-ray photoelectron spectroscopy and oxygen storage complete capacity demonstrated that the alkali metal promotor K promoted the formation of oxygen vacancies and increased the amount of active oxygen species. A proper amount of potassium can lead to the increase of dispersion of Pt, and it can enhance the performance for catalytic oxidation of CO.

Key words: CO oxidation, Alkali metal promoter K, Oxygen vacancy, Dispersion of Pt