Developing low-temperature SO2-tolerant catalysts for the selective catalytic reduction of NOx is still a challenging task.The sulfation of active metal oxides and deposition of am-monium bisulfate deactivate catalysts,due to the difficult decomposition of the as-formed sulfate species at low temperatures (＜300 ℃).In recent years,metal sulfate catalysts have attracted increasing attention owing to their good catalytic activity and strong SO2 toler-ance at higher temperatures (＞300℃);however,the SO2-tolerant mechanism of metal sul-fate catalysts is still ambiguous.In this study,Fe2(SO4)3/TiO2 and Ce2(SO4)3//TIO2 catalysts were prepared using the corresponding metal sulfate salt as the precursor.These cata-lysts were tested for their low-temperature activity and SO2 tolerance activity.Compared to Ce2 (SO4)3/TiO2,Fe2 (SO4)3/TiO2 showed significantly better low-temperature activity and SO2 tolerance.It was demonstrated that less surface sulfate species formed on Fe2(SO4)3/TiO2 and Ce2(SO4)3/TiO2.However,the presence of NO and O2 could assist the decomposition of NH4HSO4 over Fe2(SO4)3/TiO2 at a lower temperature,endowing Fe2(SO4)3/TiO2 with better low-temperature SO2 tolerance than Ce2(SO4)3/TiO2.This study unraveled the SO2-tolerant mechanism of Fe2(SO4)3/Tio2 at lower temperatures (＜300 ℃),and a potential strategy is proposed for improving the low-temperature SO2-tolerance of catalysts with Fe2(SO4)3 as the main active component or functional promoter.

Chong Feng;Lupeng Han;Penglu Wang;Xiangyu Liu;Guangyuan Zhou;Dengsong Zhang

State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering,International Joint Laboratory of Catalytic Chemistry,College of Sciences,Shanghai University,Shanghai 200444,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China

环境科学学报（英文版）

[1]Chong Feng;Lupeng Han;Penglu Wang;Xiangyu Liu;Guangyuan Zhou;Dengsong Zhang-.Unraveling SO2-tolerant mechanism over Fe2(SO4)3/TiO2 catalysts for NOx reduction)[J].环境科学学报（英文版）,2022(01):340-350

TIO2,Tio2

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