催化学报

催化学报 ›› 2014, Vol. 35 ›› Issue (11): 1990-1906.DOI: 10.1016/S1872-2067(14)60172-8

• 论文 • 上一篇    

采用CO吸附原位红外光谱研究Pt/TiO2光催化体系中助催化剂作用

沈帅a,b, 王秀丽a, 丁倩a,b, 金少青a,b, 冯兆池a, 李灿a   

  1. a 中国科学院大连化学物理研究所催化基础国家重点实验室, 洁净能源国家实验室, 辽宁大连116023;
    b 中国科学院大学, 北京100049
  • 收稿日期:2014-05-10 修回日期:2014-06-19 出版日期:2014-11-06 发布日期:2014-11-06
  • 通讯作者: 李灿
  • 基金资助:

    国家自然科学基金(21090341,21173213, 21373209);国家重点基础研究发展计划(973计划,2009CB220010,2009CB623507).

Effect of Pt cocatalyst in Pt/TiO2 studied by in situ FTIR of CO adsorption

Shuai Shena,b, Xiuli Wanga, Qian Dinga,b, Shaoqing Jina,b, Zhaochi Fenga, Can Lia   

  1. a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-05-10 Revised:2014-06-19 Online:2014-11-06 Published:2014-11-06
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21090341, 21173213, 21373209) and the National Basic Research Program of China (973 Program, 2009CB220010, 2009CB623507).

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摘要：

采用CO作为探针分子, 将原位透射红外光谱应用于研究助催化剂Pt在Pt/TiO2光催化体系中的作用. 实验发现, 光照条件下, CO的覆盖度及样品温度没有明显变化, CO在Pt/TiO2上的吸附峰红移11 cm-1, 在Pt/Al2O3上的吸附峰没有位移, 表明CO在Pt/TiO2上的红移来源于TiO2上的光生电子转移到Pt上, 这解释了为什么加入Pt助催化剂可提高光催化产氢活性.

关键词: 一氧化碳吸附, 二氧化钛, 助催化剂, 光催化, 原位红外光谱

Abstract:

In situ transmission infrared spectroscopy was used to study the role of Pt cocatalyst in Pt/TiO2 using CO as a probe molecule. An 11 cm-1 redshift of CO adsorbed on Pt/TiO2 was observed under irradiation in the absence of changes in the CO coverage or sample temperature. In contrast, no CO shift was detected on Pt/Al2O3. This indicates that the redshift of the CO adsorption peak is due to the photogenerated electron transfer from TiO2 to Pt, and this accounts for the increased photocatalytic activity by the loaded Pt cocatalyst.

Key words: Carbon monoxide adsorption, Platinum, Titania, Cocatalyst, Photocatalysis, In situ FTIR