Revealing active species of CePO_(4)catalyst for selective catalytic reduction of NO_(x)with NH_(3)  

作　　者：Yiqing Zeng Shule Zhang 

机构地区：[1]School of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Journal of Rare Earths》2022年第8期1232-1237,共6页稀土学报（英文版）

基　　金：Project supported by the Fundamental Research Funds for the Central Universities(30919011220);the Key Project of Jiangsu Province Programs for Research and Development(BE2019115);Top-notch Academic Programs Project of Jiangsu Higher Education Institutions。

摘　　要：Revealing the active species of the catalyst is conducive to the design of more efficient catalyst.Herein,we tried to demonstrate the roles of amorphous and crystalline structures on CePO_(4)catalyst during selective catalytic reduction(SCR)of NO_(x)by NH_(3).Higher calcination temperature promotes the transfer of amorphous structure to crystalline structure on the surface of CePO_(4).Both amorphous and crystalline CePO_(4)species on CePO-X samples can provide acid sites for NH_(3)adsorption,but the former can provide more acid sites.The superior redox property of surface amorphous CePO_(4)species contributes to its high NH_(3)-SCR activity at low temperature,but it also leads to the decrease of high temperature(>350℃)NH_(3)-SCR activity due to the oxidation of NH_(3).In contrast,crystalline CePO_(4)species shows high activity only at high temperature because of its poor redox property.Therefo re,it can be inferred that amo rphous and crystalline structures on CePO_(4)catalyst can be the efficient active species of NH_(3)-SCR at low and high temperature,respectively.

关 键 词：CePO_(4)catalyst Active phase Calcination temperature NH_(3)-SCR Rare earths 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]