高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (8): 1252.

• 论文 • 上一篇    下一篇

NOx气相光催化氧化降解研究

徐安武, 刘汉钦, 李玉光   

  1. 中山大学化学化工学院物理化学研究所, 广州 510275
  • 收稿日期:1999-10-21 出版日期:2000-08-24 发布日期:2000-08-24
  • 通讯作者: 徐安武(1964年出生),男,博士后,从事光催化研究.E-mail:cedc17@zsu.edu.cn
  • 基金资助:

    高等学校博士学科点专项科研基金

The Photocatalytic Oxidation Degradation of NOx in the Air with TiO2 Thin Films

XU An-Wu, LIU Han-Qin, LI Yu-Guang   

  1. Institute of Physical Chemical, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China
  • Received:1999-10-21 Online:2000-08-24 Published:2000-08-24

摘要: 利用TiO2光催化氧化技术对NOx进行了净化研究.在一定反应条件下,NOx光催化氧化降解率很高,P-25的降解达97%.考察了氧气、水含量等对NOx光催化氧化的影响,同时对NOx的吸附、光催化氧化动力学行为及机理进行了研究.利用FTIR分析确定反应产物,催化剂失活是由于反应产物硝酸吸附在催化剂表面所致.

关键词: NOx, 光催化氧化, TiO2, 气固相反应, 动力学和机理

Abstract: The gas-solid heterogeneous photocatalytic oxidation using TiO2/UVwas conducted, and it was found that the degradation efficiency of NOx in air was very high, reaching 97% in the ranges of experimental concentration. Some factors affecting NOphotocatalytic destruction were investigated. The adsorption of NOx on TiO2 thin film surface in the dark, photocatalytic reaction kinetics and mechanism were studied, and some important conclusions were drawn. The product of NOx photocatalysis was detected to be HNO3 by FTIR. The greater part of HNO3 was adsorbed on TiO2 surface, causing catalyst deactivation, but when the catalyst was washed by water, its activity was regenerated as usual. In the end, NOx photocatalytic oxidation experiments were performed under sunlight irradiation, and NOx photocatalytic degradation yields remained high. The results showed that this process has potential applications to the elimination of NOx from the air.

Key words: NOx, Photocatalysis, TiO2, Gas-phase reaction, Kinetics and mechanism

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