溶胶-凝胶原位合成宽活性温度V2O5/TiO2脱硝催化剂

doi:10.3969/j.issn.0438-1157.2014.06.021

化工学报 ›› 2014, Vol. 65 ›› Issue (6): 2098-2105.DOI: 10.3969/j.issn.0438-1157.2014.06.021

• 催化、动力学与反应器 • 上一篇下一篇

溶胶-凝胶原位合成宽活性温度V₂O₅/TiO₂脱硝催化剂

郭凤^1,2, 余剑², 初茉¹, 许光文²

1. 中国矿业大学(北京)化学与环境工程学院, 北京 100083;
2. 中国科学院过程工程研究所多相复杂系统国家重点实验室, 北京 100190

收稿日期:2013-07-18 修回日期:2014-01-19 出版日期:2014-06-05 发布日期:2014-06-05
通讯作者: 余剑，许光文
作者简介:郭凤（1983- ），女，博士研究生
基金资助:
国家自然科学基金项目（21106156）；国家高技术研究发展计划项目（2010AA065004）；中国科学院战略性先导科技专项（XDA070300）。

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

GUO Feng^1,2, YU Jian², CHU Mo¹, XU Guangwen²

1. School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, China;
2. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-07-18 Revised:2014-01-19 Online:2014-06-05 Published:2014-06-05
Supported by:
supported by the National Natural Science Foundation of China (21106156), the National High Technology Research and Development Program of China(2010AA065004) and the Strategic Priority Research Program of Chinese Academy of Sciences (XDA070300).

摘要/Abstract

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

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

中图分类号:

TQ426.6

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.

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.

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溶胶-凝胶原位合成宽活性温度V₂O₅/TiO₂脱硝催化剂

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

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