Deactivation induced by metal sulfate over MnCeOx catalyst in NH_(3)-SCR reaction at low temperature

作     者：Qiao Xie Dongqi An Linsen Zhou Tingzhen Li Zhenghua Hu Menghan Chen Menglan Ma Lei Zhang Jingfang Sun Lin Dong Qiao Xie;Dongqi An;Linsen Zhou;Tingzhen Li;Zhenghua Hu;Menghan Chen;Menglan Ma;Lei Zhang;Jingfang Sun;Lin Dong

作者机构：School of Environmental and Chemical EngineeringChongqing Three Gorges UniversityChongqing404000China Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges ReservoirChongqing Three Gorges UniversityChongqing.404000China Jiangsu Key Laboratory of Vehicle Emissions ControlCenter of Modern AnalysisSchool of EnvironmentNanjing UniversityNanjing210093China Institute of MaterialsChina Academy of Engineering PhysicsMianyang621908China 

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

年 卷 期：2024年第42卷第6期

页      面：1056-1065,I0002页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(21607019) the Scientific andTechnological Research Program of Chongqing Municipal Education Commission(KJQN202101242,KJQN202001227) the Science andTechnology Project of Wanzhou(wzstc-2019034) the Open Project Program of Key Laboratory of Water Environment Evolution andPollution Control in the Three Gorges Reservoir(WEPKL2019ZD-04) the Project Program of Chongqing Postgraduate Research andInnovation(CYS21489) 

主　　题：NH_(3)selective catalytic reduction MnCeOx catalyst Sulfation Low-temperature activity SO_(2)poisoning Rare earths 

摘      要：Sulfate adsorption is one of the factors that cause the poisoning of catalyst in the low-temperature NH_(3) selective catalytic reduction reaction(NH_(3)-SCR).In this paper,by controlling the co-adsorption time of SO_(2) and O_(2) at 150℃,a range of sulfated MnCeOx catalysts with different contents of metal sulfate species were prepared to reveal the influence of metal sulfate species content on the catalytic performances and reaction mechanisms at low *** catalytic activity below 250℃rapidly decreases with increasing metal sulfate species *** results of characterizations shed light on the reduction of specific surface area,Mn^(4+)and Ce^(3+)content,and redox ability of MnCeOx owing to the formation of metal sulfate *** experiments reveal that metal sulfate species preferentially absorb on MnOx domains rather than on CeO_(2) domains,and the adsorbed metal sulfate species can suppress the Eley-Rideal and the Langmuir-Hinshelwood reaction mechanisms over the sulfated *** the above results are detrimental to the activity of sulfated MnCeOx in the low-temperature NH3-SCR reaction.