Synergistic effect of cobalt and niobium in Co_(3)-Nb-O_(x)on performance of selective catalytic reduction of NO with NH_(3)  

作　　者：Bo-Lin Zhang Li-Feng Deng Bo Liu Chun-Yun Luo Michael Liebau Shen-Gen Zhang Roger Glaser 

机构地区：[1]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Shunde Graduate School,University of Science and Technology Beijing,Foshan 528399,China [3]Jiangsu Longkingcotech Co.,Ltd.,Yancheng 224000,China [4]Institute of Chemical Technology,Universita¨t Leipzig,Leipzig 04103,Germany e-mail:roger.glaeser

出　　处：《Rare Metals》2022年第1期166-178,共13页稀有金属（英文版）

基　　金：This work was financially supported by the National Key R&D Projects(No.2019YFC1907101);the National Natural Science Foundation of China(No.U2002212);the State Key Laboratory for Advanced Metals and Materials(No.2019Z-05);the Fundamental Research Funds for the Central Universities(Nos.FRFIDRY-20-005 and FRF-TP-20-097A1Z);the Postdoctor Research Foundation of Shunde Graduate School of University of Science and Technology Beijing(No.2020BH012).

摘　　要：Combining the redox properties of Co and the acid properties of Nb in a Co_(3)-Nb-O_(x)catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).Co_(3)O_(4)shows average activity,however,it exhibits a poor N_(2)selectivity.Nb_(2)O_(5)is not active for NH_(3)-SCR.However,the mixed Co_(3)-Nb-O_(x) catalyst shows higher NO conversion and N_(2)selectivity than the single Co_(3)O_(4)and Nb_(2)O_(5)catalysts at 100–300℃.The results of temperature programmed reduction by H_(2)and X-ray photoelectron(XP)spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co^(3+) and Oa,adjusting the activity for catalytic oxidation to a moderate level.This suppresses the formation of undesired N_(2)O from the over-oxidation of NH_(3).Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity,ensuring the high catalytic activity and N2 selectivity in NH3-SCR.

关 键 词：Co-Nb Selective catalytic reduction LOWTEMPERATURE Acid property Redox behavior 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]