Fe_2O_3对V_2O_5-WO_3/TiO_2催化剂表面性质及其性能的影响  

Effect of Fe_2O_3 on surface properties and activities of V_2O_5-WO_3/TiO_2 catalysts

作　　者：刘建华[1] 杨晓博[1] 张琛[1] 吴凡 李忠[1] 夏启斌[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]江苏肯创环境科技股份有限公司,江苏常州213161

出　　处：《化工学报》2016年第4期1287-1293,共7页CIESC Journal

基　　金：广东省科技计划项目(2011B010100030);江苏省科技支撑计划(工业)项目(BE2012064)

摘　　要：催化剂是选择性催化还原(SCR)脱硝技术的核心,研究Fe对钒钛系SCR催化剂脱硝活性及SO_2/SO_3转化率的影响具有重要意义。采用等体积浸渍法制备了不同Fe/V质量比的Fe_2O_3-V2O_5-WO_3/TiO_2催化剂,并进行表征,研究Fe对钒钛系SCR催化剂脱硝活性及SO_2/SO_3转化率的影响,并讨论Fe对于钒钛系SCR催化剂表面性质的影响。结果表明,随着催化剂表面Fe_2O_3含量增加,催化剂的脱硝效率及二氧化硫氧化率均是先上升后下降,当Fe/V质量比为3.0时,催化剂的脱硝效率和二氧化硫氧化率均达到最大值91.78%、1.01%。XPS及H_2-TPR结果表明,随着Fe_2O_3含量增加,催化剂表面钒活性组分的相对含量及V^(4+)/V^(5+)比减小,催化剂表面吸附氧(Oα)浓度增加,催化剂的氧化能力增强。NO-TPD结果表明,随着Fe_2O_3含量增加,催化剂表面吸附NO的能力增强。Effect of Fe on the denitration activity and sulfur dioxide oxidation rate of vanadium-titanium based SCR catalysts is worthy to be investigated. In this work, Fe2O3-V2O5-WO3/TiO2 catalysts with various mass ratios of Fe/V were prepared by incipient wetness impregnation method and characterized. The results showed that the denitration activity and sulfur dioxide oxidation rate of catalysts initially increased then decreased with the loading of Fe2O3. The highest denitration activity of 91.78% and sulfur dioxide oxidation ratio of 1.01% were achieved with a Fe/V mass ratio of 3.0. XPS and H2-TPR measurements showed that with the loading of Fe2O3, the content of active vanadium and V^4＋/V^5＋ ratio on the surface of catalysts decreased, while the relative-content of surface adsorption oxygen（Oα） increased hence the oxidation ability of catalysts enhanced. Moreover, the NO-TPD results showed that the capability of NO adsorption on catalyst surface enhanced with the loading of Fe2O3.

关 键 词：V2O5-WO3/TIO2 选择性催化还原 催化剂 载体 

分 类 号：TB333[一般工业技术—材料科学与工程]