Enhancing low-temperature NH_(3)-SCR performance of Fe-Mn/CeO_(2)catalyst by Al_(2)O_(3)modification  

作　　者：Lulu Li Jiawei Ji Wei Tan Wang Song Xin Wang Xiaoqian Wei Kai Guo Wanyu Zhang Changjin Tang Lin Dong 

机构地区：[1]School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China [2]School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210093,China [3]Jiangsu Key Laboratory of Vehicle Emissions Control,School of Environment,Center of Modern Analysis,Nanjing University,Nanjing 210093,China [4]School of Environment,Nanjing Normal University,Nanjing 210093,China

出　　处：《Journal of Rare Earths》2022年第9期1454-1461,I0005,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(21806077,21773106,2197681)。

摘　　要：In the work,supported catalysts of FeO_(x) and MnO_(x) co-supported on aluminum-modified CeO_(2)was synthesized for low-temperature NH_(3)-selective catalytic reduction(NH_(3)-SCR)of NO.Impressively,the SCR activity of the obtained catalyst is markedly influenced by the adding amount of Al and the appropriate Ce/Al molar ratio is 1/2.The activity tests demonstrate that Fe-Mn/Ce1 Al2 catalyst shows over 90%NO conversion at 75-250℃and exhibits better SO_(2)resistance compared to Fe-Mn/CeO_(2).Fe-Mn/Ce1 Al2 shows the expected physicochemical characters of the ideal catalyst including the larger surface and increased active reaction active sites by controlling the amount of Al doping.Also,the better catalytic activity is well correlated with the present advantaged surface adsorption oxygen species,Mn^(4+)species,Ce^(3+)species and the enhanced reducibility of Fe-Mn/Ce1 Al2,which is superior to the Fe-Mn/CeO_(2)catalyst.More importantly,we further demonstrate that the amount and strength of surface acid sites are improved by Al-doping and more active intermediates(monodentate nitrate)is generated during NH_(3)-SCR reaction.This work provides certain insight into the rational creation of simple and practical denitration catalyst environmental purification.

关 键 词：Selectivity catalytic reduction NO removal Low-temperature activity Al doping Cerium dioxide Rare earths 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]