化工学报 ›› 2016, Vol. 67 ›› Issue (4): 1287-1293.DOI: 10.11949/j.issn.0438-1157.20151284

• 催化、动力学与反应器 • 上一篇    下一篇

Fe2O3对V2O5-WO3/TiO2催化剂表面性质及其性能的影响

刘建华1, 杨晓博1, 张琛1, 吴凡2, 李忠1, 夏启斌1   

  1. 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
  • 收稿日期:2015-08-10 修回日期:2015-09-29 出版日期:2016-04-05 发布日期:2016-04-05
  • 通讯作者: 夏启斌
  • 基金资助:

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

Effect of Fe2O3 on surface properties and activities of V2O5-WO3/TiO2 catalysts

LIU Jianhua1, YANG Xiaobo1, ZHANG Chen1, WU Fan2, LI Zhong1, XIA Qibin1   

  1. 1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;
    2. Kenchuang Environmental Technology Company of Jiangsu, Changzhou 213161, Jiangsu, China
  • Received:2015-08-10 Revised:2015-09-29 Online:2016-04-05 Published:2016-04-05

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SO2/SO3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Fe2O3-V2O5-WO3/TiO2催化剂,并进行表征,研究Fe对钒钛系SCR催化剂脱硝活性及SO2/SO3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Fe2O3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H2-TPR结果表明,随着Fe2O3含量增加,催化剂表面钒活性组分的相对含量及V4+/V5+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Fe2O3含量增加,催化剂表面吸附NO的能力增强。

关键词: V2O5-WO3/TiO2, 选择性催化还原, 催化剂, 载体

Abstract:

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 V4+/V5+ 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.

Key words: V2O5-WO3/TiO2, SCR, catalyst, supporter

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