Effect of different acid anions on highly efficient Ce-based catalysts for selective catalytic reduction of NO with NH_(3)  

作　　者：De Fang Guanlin Huang Jingyi Yang Shengxing Pan Caihong Lv Da Li 

机构地区：[1]Center for Materials Research and Analysis,Wuhan University of Technology,Wuhan 430070,China [2]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [3]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [4]School of Printing&Packaging,Wuhan University,Wuhan 430072,China [5]College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 256600,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第10期1399-1411,共13页化学科学与工程前沿（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Grant No.52102367);And the tests of XRD and XPS were supported by Research and Test Center of Materials,Wuhan University of Technology;DRIFTS,TPD and TPR tests were supported by State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology.

摘　　要：Three kinds of Ce-based catalysts(CePO_(4),CeVO_(4),Ce_(2)(SO_(4))_(3))were synthesized and used for the selective catalytic reduction(SCR)of NO by NH_(3).NH_(3)-SCR performances were conducted in the temperature range of 80 to 400°C.The catalytic efficiencies of the three catalysts are as follow:CePO_(4)>CeVO_(4)>Ce_(2)(SO_(4))_(3),which is in agreement with their abilities of NH_(3)adsorption capacities.The highest NO conversion rate of CePO_(4)could reach about 95%,and the catalyst had more than 90%NO conversion rate between 260 and 320°C.The effect of PO_(4)^(3–),VO_(4)^(3–)and SO_(4)^(2–)on NH_(3)-SCR performances of Ce-based catalysts was systematically investigated by the X-ray photoelectron spectroscopy analysis,NH_(3)temperature programmed desorption,H2 temperature programmed reduction and field emission scanning electron microscopy tests.The key factors that can enhance the SCR are the existence of Ce4+,large NH_(3)adsorption capacity,high and early H2 consumptions,and suitable microstructures for gas adsorption.Finally,CePO_(4)and CeVO_(4)catalysts also exhibited relatively strong tolerance of SO2,and the upward trend about 8%was detected due to the sulfation enhancement by SO2 for Ce_(2)(SO_(4))3.

关 键 词：CePO_(4) CeVO_(4) Ce_(2)(SO_(4))_(3) selective catalytic reduction NO removal 

分 类 号：O64[理学—物理化学]