化工进展2023，Vol.42Issue(12)：6354-6362,9.DOI:10.16085/j.issn.1000-6613.2023-0052
商用SCR催化剂催化生成SO3特性
On the catalytic performance of commercial SCR catalyst for SO3 generation
摘要
Abstract
Selective catalytic reduction(SCR)can effectively remove pollutant NOx from flue gas,but it also catalyzes the generation of SO3,endangering equipment safety and atmospheric environment.In this study,the effects of temperature,flue gas atmosphere and catalyst components on the catalytic production of SO3 by SCR catalyst were investigated on a simulated SCR equipment.The changes of the catalyst before and after reaction were analyzed by X-ray fluorescence spectroscopy(XRF)and X-ray photoelectron spectroscopy(XPS).The results showed that the yield of SO3 increased with temperature and O2 content could affect the SO3 production,but the effect was minimal with O2 content over 2%.Increasing SO2 concentration decreased SO3 production rate,but total SO3 amounts still increased.At a certain concentration of NH3,the formation of SO3 was significantly inhibited,and a large amount of sulfur and ammonium salt deposition was produced.However,the oxidizing gas NO2 in NOx could increase the proportion of V5+ in the catalyst and promote the formation of SO3.In the actual reaction process,denitrification competes with SO2 oxidation.Reducing the NO2 concentration in flue gas could improve the denitrification efficiency and reduce the generation of SO3.The vanadium and titanium in the catalyst could increase the formation rate of SO3,while the silicon could inhibit the formation of SO3.This study provides a theoretical basis and reference for the operation optimization of actual SCR.关键词
选择性催化还原催化剂/催化氧化/SO3生成/烟气气氛/活性组分Key words
selective catalytic reduction(SCR)catalyst/catalytic oxidation/SO3 generation/flue gas atmosphere/active component分类
资源环境引用本文复制引用
张雪伟,张荣初,黄亚继,程好强,王圣,朱志成,李金壘,丁雪宇,李雨欣,魏泽坤..商用SCR催化剂催化生成SO3特性[J].化工进展,2023,42(12):6354-6362,9.基金项目
江苏省科技计划(BA2020001) （BA2020001）
清洁高效燃煤发电与污染控制国家重点实验室开放课题(1804). （1804）
