Alkali resistance promotion of Ce-doped vanadium-titanic- based NH3-SCR catalysts  

作　　者：Zidi Yan Xiaoyan Shi Yunbo Yu Hong He 

机构地区：[1]State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China

出　　处：《Journal of Environmental Sciences》2018年第11期155-161,共7页环境科学学报（英文版）

基　　金：financially supported by the National Key research&development(R&D)Program of China(No.2017YFC0211101);the Key Project of National Natural Science Foundation(No.21637005);Science and Technology Program of Tianjin,China(No.16YFXTSF00290)

摘　　要：The effect of K deactivation on V2OJWO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts in the selective catalytic reduction （SCR） of NOx by NH3 was studied. Ce-doped V2O5/WO3-TiO2 showed significantly higher resistance to K deactivation than V2O5/WO3-TiO2. Ce-doped V2O5/WO3-TiO2 with K/V = 4 （molar ratio） showed 90% NOx conversion at 350℃, whereas in this case V2O5/WO3-TiO2 showed no activity. The fresh and K-poisoned V2O5/WO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts were investigated by means of in situ diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS）, NH3-temperature progress decomposition （NH3-TPD）, X-ray photoelectron spectroscopy （XPS） and H2-temperature program reduction （H2-TPR）. The effect of Ce doping on the improving resistance to K of V2O5/WO3- TiO2were discussed.The effect of K deactivation on V2OJWO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts in the selective catalytic reduction （SCR） of NOx by NH3 was studied. Ce-doped V2O5/WO3-TiO2 showed significantly higher resistance to K deactivation than V2O5/WO3-TiO2. Ce-doped V2O5/WO3-TiO2 with K/V = 4 （molar ratio） showed 90% NOx conversion at 350℃, whereas in this case V2O5/WO3-TiO2 showed no activity. The fresh and K-poisoned V2O5/WO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts were investigated by means of in situ diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS）, NH3-temperature progress decomposition （NH3-TPD）, X-ray photoelectron spectroscopy （XPS） and H2-temperature program reduction （H2-TPR）. The effect of Ce doping on the improving resistance to K of V2O5/WO3- TiO2were discussed.

关 键 词：Selective catalytic reduction Ammonia Nitrogen oxides V2O5/WO3-TiO2 Alkali deactivation 

分 类 号：X701[环境科学与工程—环境工程]