Synergetic catalytic removal of chlorobenzene and NOχfrom waste incineration exhaust over MnNb0.4Ce0.2Oχcatalysts:Performance and mechanism study

作     者：Bo Yang Qijie Jin Qiong Huang Mindong Chen Leilei Xu Yuesong Shen Haitao Xu Shemin Zhu Xiujun Li Bo Yang;Qijie Jin;Qiong Huang;Mindong Chen;Leilei Xu;Yuesong Shen;Haitao Xu;Shemin Zhu;Xiujun Li

作者机构：Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET)Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function CompositesCollege of Materials Science and EngineeringNanjing TechUniversityNanjing 210009China Department of Chemistry and BiochemistryEnvironmental Science&Engineeringand Biomedical EngineeringUniversity of Texas at EL PasoEL PasoTX 79968USA 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2020年第38卷第11期

页      面：1178-1189,I0002页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(51902166) the Natural Science Foundation of Jiangsu Province(BK20190786 BK20170954) the Key Research and Development Program of Jiangsu Province(BE2018074) the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(18KJB430019) the Startup Foundation for Introducing Talent of NUIST(2017r073) the USA NIH/NIAID(R21AI107415) the NSF-PREM program(DMR 1827745) the Philadelphia Foundation。 

主　　题：Synergistic catalytic removal Nitrogen oxides(NOx) Chlorobenzene(CB) Hydrothermal stability Removal mechanism Rare earths 

摘      要：Nb doped MnCe0.2Ox complex oxides catalysts prepared via a homogeneous precipitation method were investigated for synergistic catalytic removal of NOx and chlorobenzene(CB)at low temperatures.The MnNb0.4Ce0.2Ox catalyst with a molar ratio of Nb/Mn=0.4 exhibits excellent activity and the NOx and CB removal efficiency reaches 94.5%and 96%at 220℃,respectively.Furthermore,the NOx and CB removal efficiency of MnNb0.4Ce0.2Ox still remains above 80%after injecting 300 ppm SO2 and 7 vol%H2 O for 36 h.In addition,the presence of CB and NOx+NH3 can improve the NOx and CB removal efficiency of MnNb0.4Ce0.2Ox,respectively.The analysis results from N2-BET,Py-IR,H2-TPR and NH3-TPD reveal that the introduction of Nb increases the average pore size,pore volume and surface area,promoted the growth of Lewis acid amount obviously,and enhances redox ability of MnCe0.2Ox at 100-250℃.Moreover,the molecular migration process of NOx,NH3,CB and SO2 in NH3-SCR and CB oxidation reaction over MnNb0.4Ce0.2Ox catalysts were systematically studied.In situ DRIFTS,FT-IR and XPS also confirm that the adsorption of sulfate species and SO2 on the surface of MnNb0.4Ce0.2Ox is inhibited effectively by the introduction of Nb in the presence of SO2 and H2 O.Moreover,Nb additives also enhance the structural stability of MnNb0.4Ce0.2Ox,due to the interactions among Mn,Nb and Ce.The NH3-TPD,H2-TPR and in situ DRIFTS results also confirm that the MnNb0.4Ce0.2Ox still retains abundant acid sites and high redox ability in the presence of SO2 and H2O.In summary,MnNb0.4Ce0.2Ox catalysts represent a promising and effective candidate for controlling NOx and CB at low temperatures.