NH3-SCR performances were explored to the relationship between structure morphology and physio-chemical properties over low-dimensional ternary Mn-based catalysts prepared by one-step synthesis method.Due to its strong oxidation performance,Sn-MnOx was prone to side reactions between NO,NH3 and O2,resulting in the generation of more NO2 and N2O,here most of N2O was driven from the non-selective oxidation of NH3,while a small part generated from the side reaction between NH3 and NO2.Co or Ni doping into Sn-MnOx as solid solution components obviously stronged the electronic interaction for actively mobi-lization and weakened the oxidation performance for signally reducing the selective ten-dency of side reactions to N2O.The optimal modification resulted in improving the surface area and enhancing the strong interaction between polyvalent cations in Co/Ni-Mn-SnO2 to provide more surface adsorbed oxygen,active sites of Mn3+ and Mn4+,high-content Sn4+and plentiful Lewis-acidity for more active intermediates,which significantly broadened the activity window of Sn-MnOx,improved the N2 selectivity by inhibiting N2O formation,and also contributed to an acceptable resistances to water and sulfur.At low reaction tem-peratures,the SCR reactions over three catalysts mainly obeyed the typical Elye-rideal (E-R)routs via the reactions of adsorbed L-NHx (x =3,2,1) and B-NH4+ with the gaseous NO to generate N2 but also N2O by-products.Except for the above basic E-R reactions,as increas-ing the reaction temperature,the main adsorbed NOx-species were bidentate nitrates that were also active in the Langmuir-Hinshelwood reactions with adsorbed L-NHx species over Co/Ni modified Mn-SnO2 catalyst.

Fengyu Gao;Chen Yang;Xiaolong Tang;Honghong Yi;Chengzhi Wang

School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants,University of Science and Technology Beijing,Beijing 100083,China

环境科学学报（英文版）

[1]Fengyu Gao;Chen Yang;Xiaolong Tang;Honghong Yi;Chengzhi Wang-.Co-or Ni-modified Sn-MnOx low-dimensional multi-oxides for high-efficient NH3-SCR De-NOx:Performance optimization and reaction mechanism)[J].环境科学学报（英文版）,2022(03):204-218

stronged,mobi,signally,Sn4+and,obeyed,Elye,rideal,routs

Co,modified,MnOx,low,dimensional,multi,oxides,high,efficient,NH3,SCR,De,NOx,Performance,optimization,mechanism,performances,were,explored,relationship,between,structure,morphology,physio,chemical,properties,over,ternary,catalysts,prepared,by,step,synthesis,method,Due,its,oxidation,was,prone,side,reactions,resulting,generation,more,NO2,N2O,here,most,driven,from,selective,while,small,part,generated,doping,into,solid,solution,components,obviously,electronic,interaction,actively,lization,weakened,reducing,dency,optimal,modification,resulted,improving,surface,area,enhancing,polyvalent,cations,SnO2,provide,adsorbed,oxygen,sites,Mn3+,Mn4+,content,plentiful,Lewis,acidity,intermediates,which,significantly,broadened,activity,window,improved,selectivity,inhibiting,formation,also,contributed,acceptable,resistances,water,sulfur,At,peratures,three,mainly,typical,via,NHx,NH4+,gaseous,products,Except,above,basic,increas,temperature,species,bidentate,nitrates,that,Langmuir,Hinshelwood

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