Enhancement of the SO2 resistance of Mn/TiO2 SCR catalyst by Eu modification: A mechanism study

被引：157

作者：

Liu, Jian ^{[1
,2
]}

Guo, Rui-tang ^{[1
,2
,3
]}

Li, Ming-yuan ^{[1
,2
]}

Sun, Peng ^{[1
,2
]}

Liu, Shu-ming ^{[1
,2
]}

Pan, Wei-guo ^{[1
,2
]}

Liu, Shuai-wei ^{[1
,2
]}

Sun, Xiao ^{[1
,2
]}

机构：

[1] Shanghai Univ Elect Power, Sch Energy Source & Mech Engn, Shanghai, Peoples R China

[2] Shanghai Engn Res Ctr Power Generat Environm Prot, Shanghai, Peoples R China

[3] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

来源：

FUEL | 2018年 / 223卷

基金：

上海市自然科学基金;

关键词：

SCR; Mn/TiO2; catalyst; Eu modification; SO2; resistance; LOW-TEMPERATURE SCR; CORE-SHELL STRUCTURE; NO REDUCTION; CARBON NANOTUBES; NH3-SCR REACTION; NH3; PERFORMANCE; DRIFT; DEACTIVATION; PROMOTION;

D O I：

10.1016/j.fuel.2018.03.062

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Mn/TiO2 catalyst is a promising candidate for future utilization in low-temperature NH3-SCR reaction, but its bad resistance to SO2 is still a great challenge for practical application. In this study, Eu was successfully used as the additive to improve its resistance to SO2 under SCR conditions, while the pretreatment of Mn/TiO2 and MnEu/TiO2 catalyst by SO2 + O-2 had a strong deactivation effect on them. In situ DRIFT study clarified that the deactivation of Mn/TiO2-S (SCR + SO2), Mn/TiO2-S (SO2 + O-2) and MnEu/TiO2-S (SO2 + O-2) were mainly originated from the inhibited adsorption of NH3 and NOx species, as well as the formation of a large amount surface sulfate species on them, which had a strong blacking effect on the SCR reactions over the three catalysts via both E-R and L-H routes. After the addition of Eu, SCR reaction over MnEu/TiO2 catalyst with the existence of SO2 took place through L-H pathway, accompanied by the generation of less surface sulfate species, which brought about the excellent SO2 tolerance of MnEu/TiO2 catalyst under SCR conditions.

引用

页码：385 / 393

页数：9