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TiO2 nanotube-supported V2O5 catalysts for selective NO reduction by NH3
Qin Zhong,Liyuan Xiong,Qianqiao Chen,Shule Zhang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.4
TiO2 nanotubes (TNT) were prepared by hydrothermal method at 140 oC for 23 h. The V2O5/TNT (VTNT)catalysts were obtained by impregnation in NH4VO3 solution. The VTNTs exhibited much higher denitration efficiency than those supported on the raw TiO2, and satisfactory resistance to water and sulfur. Results from BET, TEM, XRD,NH3-TPD and EPR verified that V2O5 was dispersed well on TNT, thus favoring NH3 adsorption, promoting the transformation from V5+ to V4+, conducing to the formation of oxygen vacancies and superoxide radicals in the presence of NH3 and O2, and then resulting in the high catalytic activity of VTNTs.