Mechanism of SO2 Influence on Mn/TiO2 for Low Temperature SCR Reaction

被引：1

作者：

Wei, Lu ^{[1
]}

Cui, Suping ^{[1
]}

Guo, Hongxia ^{[1
]}

Ma, Xiaoyu ^{[1
]}

Sun, Boxue

机构：

[1] Beijing Univ Technol, Beijing 100124, Peoples R China

来源：

ADVANCES IN ENERGY AND ENVIRONMENTAL MATERIALS | 2018年

基金：

中国国家自然科学基金;

关键词：

Low temperature SCR; MnOx/TiO2; SO2; DRIFT; TPD; SELECTIVE CATALYTIC-REDUCTION; NO; NH3; AMMONIA; DEACTIVATION; FTIR;

D O I：

10.1007/978-981-13-0158-2_81

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-based catalysts extremely restricted with the deactivation by SO2. In this paper, catalysts of Mn/TiO2 prepared by co-precipitation method for low temperature selective catalytic reduction (SCR) of NO with NH3 under the influence of SO2. For Mn/TiO2, NO conversion decreased rapidly from 90% to about 55% at 200 degrees C in the presence of SO2. We reveal the mechanism of SO2 effect on the adsorption of NH3 and NO based on DRIFT and TPD. The result show that SO2 can reduce the adsorption amount of NH3 on the Lewis acid sites and react with NH4+ to form NH4HSO3 on the Bronsted acid sites. In the meantime, SO2 can inhibit the adsorption of NO took part in the SCR reaction on the surface of catalyst due to the mechanical of competitive adsorption. These poisoning phenomenon of SO2 hinder the proceeding of SCR reaction.

引用

页码：789 / 796

页数：8

共 13 条

[1] Formation and reaction of ammonium sulfate salts on V2O5/AC catalyst during selective catalytic reduction of nitric oxide by ammonia at low temperatures [J].