Toxicologie environnementale et analytique

The Selective Catalytic Reduction of NOx Over Cd-Ce-Ti Metal Oxide Catalysts

Abstract

Duan Zhi-Chen, Liu Jian, Shi Juan, Zhao Zhen, Wei Yue-Chang, Li Jian-Mei, Zhang Xiao, Jiang Gui-Yuan and Duan Ai-Jun

The transition metal oxide Cd-Ce-TiO2 catalysts were prepared by the method of coprecipitation. The catalysts were characterized by means of XRD, BET, SEM, TEM, Raman and UV-Vis DRS. And the catalytic activities of the catalysts for deNOx were evaluated by NH3-SCR reaction. The nanoparticles will be formed for Cd-Ce0.2-TiOx catalysts with the different metal Cd contents. The catalysts possess the irregular, mesoporous structure. XRD and Raman data demonstrated that at the low content of Cd, anatase structure disappeared in the catalyst, but the amorphous oxide was formed. And BET pore size distribution shows the formation of the mesoporous structure in the mixed-oxide. Among all the catalysts, 2% Cd-Ce0.2-TiOx catalyst exhibits the best NH3-SCR performance with a wide temperature window from 225 to 525°C for NO conversion above 90%.