Fe2O3对V2O5-WO3/TiO2催化剂表面性质及其性能的影响

doi:10.11949/j.issn.0438-1157.20151284

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

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

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/Abstract

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

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

中图分类号:

TB333

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.

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.

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Fe₂O₃对V₂O₅-WO₃/TiO₂催化剂表面性质及其性能的影响

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

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