Influence of CePO_(4)with different crystalline phase on selective catalytic reduction of NO_(x)with ammonia  

作　　者：Chen Zhao Yushi Li Zhiping Zhang Huansheng Tan Fulong Yuan Yujun Zhu 

机构地区：[1]Key Laboratory of Functional Inorganic Material Chemistry of Ministry of Education,Heilongjiang University,Harbin 150080,China

出　　处：《Journal of Rare Earths》2022年第8期1219-1231,共13页稀土学报（英文版）

摘　　要：A series of cerium phosphate catalysts with different crystal phases were synthesized by hydrothermal method and co-precipitation method.Hexagonal cerium phosphate(CePO_(4)-H)shows better NH_(3)-SCR denitration activity than monoclinic cerium phosphate(CePO_(4)-M)and mixed phases of CePO_(4)-H and CePO_(4)-M.Moreover,CePO_(4)-H also exhibits excellent activity stability with stream time and cycling stability.Various characterizations were carried out to explain the effects of different crystal phases of CePO_(4)on the activity.Among these catalysts,CePO_(4)-H has much stronger surface acidity that is conducive to the adsorption and activation of NH_(3),and more surface adsorbed oxygen species that can effectively improve SCR activity.In situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)were performed to investigate the adsorption and reaction of NH_(3)and NO_(x)on CePO_(4)-H and CePO_(4)-M,and the results suggest that the better activity over CePO_(4)-H follows mainly the Eley-Rideal mechanism in the activity temperature window(300-500℃)with 100%NO conversion.

关 键 词：Selective catalytic reduction NO removal Hexagonal cerium phosphate Monoclinic cerium phosphate Surface acidity Rare earths 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]