γ-Al2O3对SCR脱硝催化剂V2O5-WO3/TiO2的改性研究

焦峰斌; 张亚平; 沈凯; 孙克勤; 徐海涛; 周长城

γ-Al₂O₃对SCR脱硝催化剂V₂O₅-WO₃/TiO₂的改性研究

东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室, 江苏南京 210096

基金项目: 国家高技术研究发展计划(863计划, 2007AA061802); 江苏省自然科学基金(BK2012347)。

详细信息

通讯作者:
张亚平,女,博士,讲师,E-mail:amflora@seu.edu.cn。

中图分类号: O643.36
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出版历程
- 收稿日期: 2011-12-30
- 修回日期: 2012-03-08
- 刊出日期: 2012-10-31

γ-Al₂O₃ modification on V₂O₅-WO₃/TiO₂ catalyst for selective catalytic reduction(SCR) of NO

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China

摘要

摘要: 采用溶胶凝胶法制备了不同γ-Al₂O₃含量的钛铝复合载体,以此为载体采用浸渍法负载V₂O₅和WO₃制备了一系列催化剂。采用X射线衍射(XRD)、比表面积测定(BET)、程序升温还原(H₂-TPR)、高分辨率透射电子显微镜(HRTEM)等表征技术对催化剂表面形态进行分析,同时在模拟氨气选择性催化还原NO(NH₃-SCR)的反应条件下,对催化剂的脱硝反应活性和SO₂抗中毒进行考察。结果发现,TiO₂和γ-Al₂O₃之间的协同作用使得V₂O₅-WO₃/TiO₂-γ-Al₂O₃催化剂的脱硝效率及活性窗口明显优于单一载体制备的催化剂,表现出了良好的热稳定性和抗SO₂毒化能力,特别是V₂O₅-WO₃/TiO₂-15% γ-Al₂O₃在310~460 ℃,NO的转化率均在80%以上,反应窗口最宽。各种表征结果表明,TiO₂-γ-Al₂O₃复合载体中γ-Al₂O₃高度分散在TiO₂上,复合载体具有较大的比表面积,同时具有较强的还原能力。
- Al₂O₃ /
- TiO₂ /
- 选择性催化还原反应 /
- 催化剂 /
- 改性
Abstract: A series of titania-alumina mixed oxide with different amount of γ-Al₂O₃were prepared by sol-gel methods, which were loaded by V₂O₅ and WO₃ to obtain several SCR catalysts. Surface properties of those samples were studied by various characterizations techniques, like XRD, BET, H₂-TPR and HRTEM. The catalytic performance for the selective catalytic reduction of NO with NH₃(NH₃-SCR)and the effect of SO₂ in the simulated smog on the catalytic activity were investigated as well. It is found that the synergy between γ-Al₂O₃ and TiO₂ can improve effectively the catalytic performance of V₂O₅-WO₃/TiO₂-γ-Al₂O₃ catalysts effectively and broaden the temperature window of SCR activity as well as strengthen the resistance to SO₂ poisoning. In particular, the V₂O₅-WO₃/TiO₂-15% γ-Al₂O₃ sample exhibited 80% NO conversion in the wide temperature range of 310~460 ℃.All the characterization results show that γ-Al₂O₃ is in a well-dispersed state on the surface of TiO₂; the composite support has a large specific surface area and the binary oxide possesses a comparatively strong redox property.
- Al₂O₃ /
- TiO₂ /
- SCR /
- catalyst /
- modification

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参考文献(21)

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