溶胶-凝胶原位合成钒钨钛催化剂及NH3-SCR性能

doi:10.11949/j.issn.0438-1157.20170434

化工学报 ›› 2017, Vol. 68 ›› Issue (10): 3747-3754.DOI: 10.11949/j.issn.0438-1157.20170434

• 催化、动力学与反应器 • 上一篇下一篇

溶胶-凝胶原位合成钒钨钛催化剂及NH₃-SCR性能

郭凤, 余剑, Tran Tuyet-Suong, 李长明, 许光文

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:2017-04-19 修回日期:2017-07-07 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 余剑,yujian@ipe.ac.cn
基金资助:
国际合作项目（2016YFE0128300）；中国科学院科技服务网络计划项目（KFJ-SW-STS-149）；四川省科技计划项目（2016JZ0011）；国家自然科学基金项目（51574214）。

In situ preparation of mesoporous V₂O₅-WO₃/TiO₂ catalyst by sol-gel method and its performance for NH₃-SCR reaction

GUO Feng, YU Jian, TRAN Tuyet-Suong, LI Changming, XU Guangwen

State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2017-04-19 Revised:2017-07-07 Online:2017-10-05 Published:2017-10-05
Supported by:
supported by the National Natural Science Foundation of China(51574214).

摘要/Abstract

摘要：

利用溶胶-凝胶技术原位合成V₂O₅-WO₃/TiO₂介孔结构脱硝催化剂。通过XRD、BET、SEM和XPS等手段对催化剂结构与组成进行表征，发现结构导向剂CTAB促进催化剂的比表面积和孔容的增加，促进催化剂活性组分的分散与裸露的V活性组分数量增加；且随CTAB含量的增加，V⁴⁺/V⁵⁺的比值降低，即降低了催化剂表面钒物种的氧化能力，有利于提高催化剂的低温脱硝活性与高温选择性。催化活性评价结果表明，CTAB对催化剂的脱硝活性有显著促进作用，当CTAB的添加量为0.01（质量）时，催化剂的脱硝活性大于90%的温度窗口最宽为212~393℃，200℃时脱硝效率达85.6%。

关键词: 溶胶-凝胶原位合成, 催化, 结构导向剂, 介孔结构

Abstract:

A series of V₂O₅-WO₃/TiO₂ catalysts were prepared by the in situ sol-gel method with different amounts of cetyl trimethyl ammonium bromide (CTAB) as structure-directing agent.The XRD,BET,SEM and XPS were performed to characterize the catalysts.The results demonstrated that the introduction of CTAB facilitated the formation of mesoporous structure with increased specific surface area and pore volume,resulting in the high dispersion of active components and thus more bared V₂O₅ on the surface of support.Moreover,the ratios of V⁴⁺/V⁵⁺ decrease with the increase of CTAB content,which reduce the oxidation capacity of the surface vanadium species and enhance the low-temperature activity together with the high-temperature selectivity.The results of activity evaluation indicate that the introduction of CTAB obviously promote the catalytic performance,and CTAB-0.01 catalyst has the highest low-temperature denitration activity (85.6% NO conversion at 200℃) and the widest temperature window (above 90% NO conversion from 212℃ to 393℃).

Key words: in situ sol-gel, catalysis, structure-directing agent, mesoporous structure

中图分类号:

O643

郭凤, 余剑, Tran Tuyet-Suong, 李长明, 许光文. 溶胶-凝胶原位合成钒钨钛催化剂及NH₃-SCR性能[J]. 化工学报, 2017, 68(10): 3747-3754.

GUO Feng, YU Jian, TRAN Tuyet-Suong, LI Changming, XU Guangwen. In situ preparation of mesoporous V₂O₅-WO₃/TiO₂ catalyst by sol-gel method and its performance for NH₃-SCR reaction[J]. CIESC Journal, 2017, 68(10): 3747-3754.

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溶胶-凝胶原位合成钒钨钛催化剂及NH₃-SCR性能

In situ preparation of mesoporous V₂O₅-WO₃/TiO₂ catalyst by sol-gel method and its performance for NH₃-SCR reaction

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