催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (5): 453-457.

• 研究论文 • 上一篇    下一篇

Ce0.5-xZr0.5-xBa2xO2负载TiO2光催化降解气相苯

皮展,蔡黎,钟俊波,龚茂初,陈耀强   

  1. 四川大学催化材料研究所, 四川成都 610064
  • 收稿日期:2008-05-25 出版日期:2008-05-25 发布日期:2012-05-02

Gas-Phase Photocatalytic Oxidation of Benzene over TiO2 Supported on Ce0.5-xZr0.5-xBa2xO2

PI Zhan, CAI Li, ZHONG Junbo, GONG Maochu, CHEN Yaoqiang   

  1. Institute of Catalytic Material, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2008-05-25 Online:2008-05-25 Published:2012-05-02

PDF

717

被引次数

20

摘要： 在密闭不锈钢反应器内研究了Ce0.5-xZr0.5-xBa2xO2负载锐钛型TiO2光催化降解气相苯的性能. 确定了该系列光催化剂的最佳Ba含量,并应用X射线衍射、紫外-可见漫反射光谱以及X射线光电子能谱对催化剂进行了表征. 结果表明, TiO2在载体表面均匀分散. 在210～400 nm范围内, TiO2/Ce0.5-xZr0.5-xBa2xO2比TiO2吸收更多的紫外光. TiO2/Ce0.5-xZr0.5-x-Ba2xO2包含Ti和O两种元素, TiO2/Ce0.5-xZr0.5-xBa2xO2的Ti 2p结合能向低能端偏移. Ce0.5-xZr0.5-xBa2xO2表面负载TiO2能有效提高催化剂的光催化活性. Ce0.5-xZr0.5-xBa2xO2的作用是转移电子和使催化剂在紫外区的吸收增强.

关键词: 二氧化钛, 光催化氧化, 苯, 铈-锆固溶体, 挥发性有机化合物

Abstract: Photooxidation of gaseous benzene was investigated using anatase TiO2 as the catalyst in a closed steel reactor. The photocatalytic activity can be greatly improved by supporting TiO2 on Ce0.5-xZr0.5-xBa2xO2. The optimal Ba content in the photocatalyst was investigated. The prepared photocatalysts were characterized byX-raydiffraction, UV-Vis diffuse reflectance spectroscopy, andX-rayphotoelectron spectroscopy. The results revealed that the deposited titania is well dispersed as in the Ce0.5-xZr0.5-xBa2xO2 matrix. TiO2/Ce0.5-xZr0.5-x-Ba2xO2 absorbs much more ultraviolet light in the range of 210-400 nm than TiO2. There are Ti and O elements on the surface of TiO2/Ce0.5-xZr0.5-xBa2xO2, and the binding energy of Ti 2p of TiO2/Ce0.5-xZr0.5-xBa2xO2 shifts to a lower value. Based upon the above observations, it is concluded that the role of Ce0.5-xZr0.5-xBa2xO2 is to transfer electrons and enhance the light absorption of the catalyst in the region of 210-400 nm.

Key words: titanium dioxide, photocatalytic oxidation, benzene, ceria-zirconia solid solution, volatile organic compound