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

doi:10.11949/j.issn.0438-1157.20151284

Abstract

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(O_α) 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

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(O_α)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

CLC Number:

TB333

LIU Jianhua, YANG Xiaobo, ZHANG Chen, WU Fan, LI Zhong, XIA Qibin. Effect of Fe₂O₃on surface properties and activities of V₂O₅-WO₃/TiO₂ catalysts[J]. CIESC Journal, 2016, 67(4): 1287-1293.

刘建华, 杨晓博, 张琛, 吴凡, 李忠, 夏启斌. Fe₂O₃对V₂O₅-WO₃/TiO₂催化剂表面性质及其性能的影响[J]. 化工学报, 2016, 67(4): 1287-1293.

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Effect of Fe₂O₃on surface properties and activities of V₂O₅-WO₃/TiO₂ catalysts

Fe₂O₃对V₂O₅-WO₃/TiO₂催化剂表面性质及其性能的影响

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