Denitrification performance and sulfur resistance mechanism of Sm-Mn catalyst for low temperature NH_(3)-SCR  

作　　者：Junlin Xie Yanli Ye Qinglei Li Tianhong Kang Sensheng Hou Qiqi Jin Feng He De Fang 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [2]Center for Materials Research and Analysis,Wuhan University of Technology,Wuhan 430070,China [3]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Frontiers of Chemical Science and Engineering》2023年第5期617-633,共17页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52102367)and the Fundamental Research Funds for the Central Universities(WUT,effect of the synthesis method on denitrification performances of the Mn-based spinel catalysts).

摘　　要：MnO_(x)and Sm–Mn catalysts were prepared with the coprecipitation method,and they showed excellent activities and sulfur resistances for the selective catalytic reduction of NO_(x)by NH_(3)between 50 and 300℃in the presence of excess oxygen.0.10Sm–Mn catalyst indicated better catalytic activity and sulfur resistance.Additionally,the Sm doping led to multi-aspect impacts on the phases,morphology structures,gas adsorption,reactions process,and specific surface areas.Therefore,it significantly enhances the NO conversion,N_(2)selectivity,and sulfur resistance.Based on various experimental characterization results,the reaction mechanism of catalysts and the effect of SO_(2)on the reaction process about the catalysts were extensively explored.For 0.10Sm–Mn catalyst,manganese sulfate and sulfur ammonium cannot be generated broadly under the influence of SO_(2)and the amount of surface adsorbed oxygen.The Bronsted acid sites strengthen significantly due to the addition of SO_(2),enhancing the sulfur resistance of the 0.10Sm–Mn catalyst.

关 键 词：MnO_(x) Sm–Mn CATALYST NH_(3)-SCR sulfur resistance 

分 类 号：O64[理学—物理化学]