文献类型：期刊文章

作　　者：刘雪松[1,2] 吴晓东[1,2] 许腾飞[1] 翁端[1,2] 司知蠢[2] 冉锐[1]

机构地区：[1]清华大学材料学院先进材料教育部重点实验室,北京100084 [2]清华大学深圳研究生院新材料研究所,广东深圳518055

出　　处：《Chinese Journal of Catalysis》

基　　金：supported by the National Natural Science Foundation of China (51372137);the National High Technology Research and Development Program of China (863 Program,2015AA034603)~~

年　　份：2016

卷　　号：37

期　　号：8

起止页码：1340-1346

语　　种：中文

收录情况：AJ、BDHX、BDHX2014、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2015_2016、EI(收录号：20163602768258)、JST、RSC、SCI(收录号：WOS:000381326900019)、SCI-EXPANDED(收录号：WOS:000381326900019)、SCIE、SCOPUS、WOS、ZGKJHX、核心刊

摘　　要：V2O5/WO3‐TiO2 and V2O5/WO3‐TiO2‐SiO2 catalysts were prepared by a wetness impregnation method, and both the catalysts were hydrothermally aged at 750℃ in 10 vol%H2O/air for 24 h. The catalysts were evaluated for NOx conversion using NH3 as the reductant. Hydrothermal ageing decreased the NOx conversion of V2O5/WO3‐TiO2 catalyst severely over the entire measured tem‐perature range. Interestingly, the NH3‐SCR activity of the silica‐modified catalyst at 220–480℃ is enhanced after ageing. The catalysts were characterized by X‐ray diffraction, nitrogen adsorption, X‐ray fluorescence, Raman spectroscopy, H2 temperature‐programmed reduction, and NH3 temper‐ature‐programmed desorption. The addition of silica inhibited the phase transition from anatase to rutile titania, growth of TiO2 crystallite size and shrinkage of catalyst surface area. Consequently, the vanadia species remained highly dispersed and the hydrothermal stability of the V2O5/WO3‐TiO2 catalyst was significantly improved.

关 键 词：V2O5/WO3-TiO2  SILICA NH3-SCR  Hydrothermal stability  Polymeric vanadia  DE-NOX

分 类 号：O643.36]