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Promotion effect of bulk sulfates over CeO_(2)for selective catalytic reduction of NO by NH_(3)at high temperatures

查看全文 作　　者：Jiawei [1]Ji;Li [1]Han;Wang [1]Song;Jingfang [4]Sun;Weixin [2]Zou;Changjin [3]Tang;Lin [1,2,4]Dong 高影响力作者 机构地区：[1]Laboratory of Mesoscopic Chemistry of MOE,School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China;[2]School of the Environment,Nanjing University,Nanjing 210023,China;[3]School of Environment,Nanjing Normal University,Nanjing 210023,China;[4]Jiangsu Key Laboratory of Vehicle Emission Control,Center of Modern Analysis,Nanjing University,Nanjing 210023,China高影响力机构 出　　处：《Chinese Chemical Letters》索引2023年第34卷第5期,共4页高影响力期刊 基　　金：The financial supports from the National Natural Science Foundation of China(Nos.21976081,21972062);Major Scientific and Technological Project of Bingtuan(No.2018AA002),are greatly acknowledged。 摘　　要：Understanding the influence of sulfates over catalysts for selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR)is crucial due to the universal presence of SO_(2)in exhaust gas.Depending on the degree of sulfation,there mainly exist surface and bulk sulfates and NH_(3)-SCR activity is generally considered to suffer more from bulk sulfates.Herein,the unique function of bulk sulfates over Ce O_(2)in promoting hightemperature SCR reaction is revealed.Notably,compared with CeO_(2)dominated with surface sulfates(S-CeO_(2)-4h)and commercial V_2O_5-WO_(3)/TiO_(2),CeO_(2)with bulk sulfates(S-Ce O_(2)-72h)exhibits admirable NO conversion at the temperature range of 400-550℃.Bulk sulfates provide more Br?nsted acid sites with stronger strength for NH_(3)adsorption.Moreover,the oxidation ability of Ce O_(2)is significantly inhibited due to electron-withdrawing effect from bulk sulfates,which alleviates NH_(3)oxidation at high temperatures.More NH_(3)adsorption with high stability and limited NH_(3)oxidation capacity ensure the excellent catalytic performance for S-CeO_(2)-72h in high-temperature denitration.This work provides new insight of bulk sulfates in promoting SCR activity and open a new avenue to design de NO_xcatalysts employed at high temperatures. 关 键 词：NH_(3)-SCR CeO_(2) Bulk sulfates High temperature denitration NH_(3)adsorption NH_(3)oxidation
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