Preparation of V2O5/TiO2 catalyst with in-situ sol-gel method for denitration in wide temperature window

doi:10.3969/j.issn.0438-1157.2014.06.021

Abstract

Abstract: A series of V₂O₅/TiO₂ catalysts with different amounts of V₂O₅ were prepared with the in-situ sol-gel method. Characterization of the catalysts were performed with N₂ adsorption and desorption, X-ray diffraction (XRD), UV-Vis spectroscopy (UV-Vis) and temperature programmed desorption of NH₃(NH₃-TPD). All catalysts exhibited mesoporous structure, high dispersion of V₂O₅ on the surface of TiO₂ and three typical acid sites. Evaluation of the catalytic performance for NH₃-denitration revealed good activity for low-temperature denitration of the catalyst, which increased with increasing amount of V₂O₅. The V₂O₅/TiO₂ catalyst with 10% (mass) V₂O₅ showed the widest temperature window of 200-450℃ for NO conversions of about 80% at a NH₃/NO ratio of 0.8. The catalytic performance for denitration did not obviously decrease in a 20 h continuous denitration test at 240℃ for the simulated flue gas containing 0.06% (vol) SO₂ and 10% (vol) H₂O. The UV-Vis analysis clarified that for NH₃-denitration the unimer and low-poly vanadates are the active components of the prepared V₂O₅/TiO₂catalysts.

Key words: in-situ sol-gel, SCR, catalyst, catalysis, low-temperature SCR

摘要： 利用溶胶-凝胶技术原位合成一系列不同V₂O₅担载量的V₂O₅/TiO₂催化剂，通过BET、XRD、NH₃-TPD及紫外-可见光等手段对催化剂进行表征。结果表明：制备的催化剂均具有介孔结构，V₂O₅在TiO₂表面高度分散，且存在3种典型的酸性位。通过选择性催化还原反应对V₂O₅/TiO₂催化剂进行活性评价，结果显示随着V₂O₅含量的增加，NO转化率大于75%的温度窗口向低温方向偏移，含10% （质量分数）V₂O₅的催化剂的NO转化率为80%的温度窗口最宽为200～450℃，240℃时20 h连续实验表现出稳定的抗硫抗水性能。结合紫外-可见光谱分析，揭示了钒掺杂所形成的单聚和低聚钒酸盐为催化剂的活性组分。

关键词: 溶胶-凝胶法原位合成, 选择催化还原, 催化剂, 催化作用, 低温脱硝

CLC Number:

TQ426.6

GUO Feng, YU Jian, CHU Mo, XU Guangwen. Preparation of V₂O₅/TiO₂ catalyst with in-situ sol-gel method for denitration in wide temperature window[J]. CIESC Journal, 2014, 65(6): 2098-2105.

郭凤, 余剑, 初茉, 许光文. 溶胶-凝胶原位合成宽活性温度V₂O₅/TiO₂脱硝催化剂[J]. 化工学报, 2014, 65(6): 2098-2105.

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Preparation of V₂O₅/TiO₂ catalyst with in-situ sol-gel method for denitration in wide temperature window

溶胶-凝胶原位合成宽活性温度V₂O₅/TiO₂脱硝催化剂

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