化学学报 ›› 2006, Vol. 64 ›› Issue (15): 1611-1614. 上一篇    

研究简报

NO气体在TiO2表面的吸附行为

汪洋*   

  1. (1 浙江理工大学理学院 杭州 310018)
    (2 兰州交通大学光电技术与智能控制教育部重点实验室 兰州 730070)
  • 收稿日期:2005-11-17 修回日期:2006-03-23 出版日期:2006-08-14 发布日期:2006-08-14
  • 通讯作者: 汪洋

Adsorption Action of NO Gas on the TiO2 Surface

WANG Yang*   

  1. (1 College of Science, Zhejiang Sci-Tech University, Hangzhou 310018)
    (2 Key Laboratory of Photoelectric Technology and Intelligent Control, Lanzhou Jiaotong University, Lanzhou 730070)
  • Received:2005-11-17 Revised:2006-03-23 Online:2006-08-14 Published:2006-08-14
  • Contact: WANG Yang

采用TPD (Temperature Programmed Desorption)试验方法测定了NO在TiO2表面吸附后的脱附谱, 揭示了气体脱附量的变化规律. 结果表明, NO在TiO2表面吸附后可在两个峰值温度450和980 K脱附出N2气体, 其活化能分别是0.48 和2.5 eV. TiO2表面经预覆氧处理后, N2的脱附量降低. N2的脱附量随NO气体暴露量增加而增加, 但当气体覆盖度超过一定值后, 脱附量趋于定值. 脱附峰值温度随气体暴露量的增加而降低.

关键词: NO, 吸附, TiO2, TPD

The desorption spectrum of NO adsorbed on the surface of TiO2 powder was determined by Temperature Programmed Desorption (TPD). The changes of desorption amount were discussed. The results indicate that there exist two peak temperatures, 450 and 980 K, as N2 desorption followed with the NO adsorption on TiO2, and their activation energies are 0.45 and 2.5 eV, respectively. The intensity of N2 desorption decreases if the TiO2 powder is pretreated under O2 atmosphere. With increasing the exposure amount of NO gas, the desorption amount of N2 increased and the peak desorption temperature decreased. However, the desorption amount of N2 tended to become constant when the surface coverage of NO gas was higher than a certain value.

Key words: NO, adsorption, TiO2, temperature programmed desorption