NOx气相光催化氧化降解研究

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。

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

The gas solid heterogeneous photocatalytic oxidation using TiO 2/UV was conducted, and it was found that the degradation efficiency of NO x in air was very high, reaching 97% in the ranges of experimental concentration. Some factors affecting NO photocatalytic destruction were investigated. The adsorption of NO x on TiO 2 thin film surface in the dark, photocatalytic reaction kinetics and mechanism were studied, and some important conclusions were drawn. The product of NO x photocatalysis was detected to be HNO 3 by FTIR. The greater part of HNO 3 was adsorbed on TiO 2 surface, causing catalyst deactivation, but when the catalyst was washed by water, its activity was regenerated as usual. In the end, NO x photocatalytic oxidation experiments were performed under sunlight irradiation, and NO x photocatalytic degradation yields remained high. The results showed that this process has potential applications to the elimination of NO x from the air.