添加FeO_(x)对CeO_(x)-MnO_(x)-TiO_(2)/石墨烯催化剂低温SCR脱硝性能的影响

Effect of FeO_(x) Addition on Low Temperature SCR Denitrification Performance of CeO_(x)-MnO_(x)-TiO_(2)/Graphene Catalysts

低温选择性催化还原(SCR)脱硝催化剂是目前烟气脱硝领域研究的热点。利用超声浸渍法制备了FeO_(x)-CeO_(x)-MnO_(x)-TiO_(2)/石墨烯低温SCR脱硝催化剂,研究和分析了FeO_(x)添加量对催化剂脱硝性能的影响,并借助TEM、XPS分析探究了FeO_(x)在催化剂中的作用及内在机制。结果表明,当Fe/Mn摩尔比为0.2时,催化剂具有最佳的脱硝效果,在140℃即具有90%的NO转化率;同时对催化剂的抗SO_(2)和抗水性能进行了测定,表明FeO_(x)的添加有利于其抗性的提升,在SO_(2)和水共存的情况下,仍具有80%以上的NO转化率。在此基础上,通过对比SCR反应前后催化剂的FT-IR分析结果,剖析了可能的抗SO_(2)抗水机理。

The catalysts for low temperature selective catalytic reduction(SCR)denitrification is the research hotpot in the field of flue gas denitrification.FeO_(x)-CeO_(x)-MnO_(x)-TiO_(2)/graphene catalysts for low temperature SCR denitrification were synthesized by ultrasonic impregnation.Effect of addition amount of FeO_(x)on denitrification performance of the catalysts was studied, and the role and mechanism of FeO_(x)in catalyst were investigated by TEM and XPS analysis.The results show that when Fe/Mn molar ratio is 0.2,the catalyst has the best denitrification performance.When the temperature is 140 ℃,NO conversion rate is as high as 90%.The resistance of catalysts to SO_(2)and HO were also examined.The results show that addition of FeO_(x)is beneficial to resistance of catalysts, and NO conversion is 80% above when SO_(2)and HO exists together in the flue gas.On this basis, the possible mechanism of resistance for catalysts to SO_(2)and HO are discussed by comparison of FT-IR results before and after denitrification reaction.