化工学报2019，Vol.70Issue(8)：3000-3010,11.DOI:10.11949/0438-1157.20190318
FexMnCe1-AC低温SCR催化剂SO2中毒机理研究
Mechanism study on SO2 poisoning of FexMnCe1-AC catalyst for low-temperature SCR
摘要
Abstract
A series of FexMnCe1-AC catalysts were prepared by ultrasonic-assisted impregnation method with activated carbon as carrier. The low-temperature NH3-SCR denitrification activity of the catalysts was investigated, and the best activity catalyst was established. The effect of SO2 on its denitration performance was also explored. The results showed that Fe0.1MnCe1-AC catalyst exhibited best denitration efficiency at low-temperature among prepared catalysts, the conversion rate of NO exceeded 90% with the temperature range from 120℃ to 220℃ (no SO2). In addition, the catalyst could maintain NO conversion rate of approximately 77% under the atmosphere of 180℃and SO2 concentration of 429 mg/m3. The mechanism of SO2 poisoning on the catalyst was characterized with BET, XRD, XPS, H2-TPR NH3-TPD, FT-IR and TGA. It was observed that SO2 could form ammonium sulfate ( (NH4)2SO4, (NH4)2SO3 ), and MnSO4 with NH3 and the metal components in the catalyst, which changed the pore structure of the fresh catalyst and reduced the Br?nsted acid sites and Lewis acid sites on the catalyst surface. These variation made the inhibitory effect on the catalytic adsorption capacity of NH3. Moreover, SO2 also promoted a decrease in the number of Mn4+, Ce3+, Fe3+and Fe3+—OH-groups in the catalyst, and lessened the surface reducible species, thereby reducing the activity of the catalyst denitration.关键词
选择性催化还原/活性炭/催化剂/氮氧化物/二氧化硫/中毒机理Key words
selective catalytic reduction/ activated carbon/ catalyst/ nitric oxide/ sulfur dioxide/ poisoning mechanism分类
化学化工引用本文复制引用
陈潇雪,宋敏,孟凡跃,卫月星..FexMnCe1-AC低温SCR催化剂SO2中毒机理研究[J].化工学报,2019,70(8):3000-3010,11.基金项目
燃煤过程有机污染物排放控制技术(2018YFB0605200) （2018YFB0605200）
