物理化学学报 >> 2003, Vol. 19 >> Issue (02): 100-104.doi: 10.3866/PKU.WHXB20030202

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在Pd/TiO2上CO的光催化增强效应

张敏;金振声;王守斌;张顺利;张治军   

  1. 中国科学院兰州化学物理研究所,固体润滑国家重点实验室, 兰州　730000; 河南大学特种功能材料省重点实验室，开封　475001
  • 收稿日期:2002-04-02 修回日期:2002-06-24 发布日期:2003-02-15
  • 通讯作者: 金振声 E-mail:zhenshengjin@henu.edu.cn

The Photocatalytic Enhancement Effect of CO on Pd/TiO2

Zhang Min;Jin Zhen-Sheng;Wang Shou-Bin;Zhang Shun-Li;Zhang Zhi-Jun   

  1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou　730000;Laboratory of Special Functional Materials, Henan University, Kaifeng　475001
  • Received:2002-04-02 Revised:2002-06-24 Published:2003-02-15
  • Contact: Jin Zhen-Sheng; E-mail:zhenshengjin@henu.edu.cn

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摘要： 在Pd(2％)/TiO2上CO催化氧化的研究中发现：室温下， 以黑光灯（λ=365 nm）照时， CO的氧化活性比暗态显著提高，产生了明显的光催化增强效应（两者速率常数比约为15）.但在TiO2上，无论暗态还是黑光灯（λ=365 nm）照，均无CO氧化反应发生.这可能是由于氧分子解离吸附时的键能减弱，使Pd表面氧原子（或O－）浓度增加和氧原子的溢流（oxygen spillover）两种效应结合产生的.

关键词: CO氧化, Pd(2％)/TiO2, 氧原子, 光催化增强, 溢流

Abstract: The photocatalytic oxidation of CO on Pd(2％)/TiO2 was investigated. It was found that CO oxidation activity on Pd/TiO2 was greatly enhanced if illuminated with UV light(λ=365 nm) as compared with that in the dark(the ratio of the above two rate constants is ca. 15). But on bare TiO2 no CO oxidation reaction was observed both in the dark and under UV light illumination. The photocatalytic enhancement of CO on Pd/TiO2 could be elucidated by the increase of surface concentration of oxygen atoms (or O－) on Pd and the spillover of oxygen atoms from Pd to TiO2.

Key words: CO oxidation, Pd(2％)/TiO2, Oxygen atom, Photocatalytic enhancement, Spillover