V2O5-CuO/TiO2催化剂中低温选择性催化NOx还原研究

陈志航; 晏萍; 唐志雄; 岑超平; 陈定盛; 方平; 罗建中

V₂O₅-CuO/TiO₂催化剂中低温选择性催化NO_x还原研究

1.
环境保护部华南环境科学研究所, 广东广州 510655;
2.
广东工业大学环境科学与工程学院, 广东广州 510006

基金项目: 广东省科技计划项目(2010B031900028); 广东省自然科学基金博士启动项目(S2011040003459)。

详细信息

通讯作者:
岑超平(1964-), 女, 博士, 研究员, E-mail: cenchaoping@scies.org。

中图分类号: O643.3
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- 被引次数: 0
出版历程
- 收稿日期: 2011-03-11
- 修回日期: 2011-07-02
- 刊出日期: 2012-04-30

Selective catalytic reduction of NO_x on V₂O₅-CuO/TiO₂ catalyst at middle-low temperature

1.
South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China;
2.
Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China

摘要

摘要: 浸渍法制备了一系列V₂O₅-CuO/TiO₂催化剂,考察中低温(200~300℃)条件下,以氨为还原剂选择性催化还原NO_x的活性,并利用比表面积及微孔孔隙分析仪(BET)、X射线衍射(XRD)对催化剂进行微观表征和分析。结果表明,500℃焙烧的2V16Cu/TiO₂催化剂展示了最佳的中低温催化活性和较宽的活性温度范围,在空速6.0×10⁴h^-1、225℃条件下,NO_x转化率达97.3%,250℃时达到100%,温度升至300℃,催化活性仍保持在100%。XRD结果表明,随着Cu负载量的增加,逐渐显现CuO的特征峰。结合活性评价数据说明,CuO是VCu/TiO₂催化剂的主要活性组分之一,是降低SCR催化反应温度的重要因素。BET结果表明,CuO的负载对钒钛催化剂的表面结构有较大影响。耐硫性实验结果表明,添加钒氧化物制备的2V16Cu/TiO₂催化剂的抗硫性能有所改善。
- 钒铜复合氧化物 /
- 选择性催化还原 /
- 中低温 /
- 氮氧化物 /
- 氨
Abstract: In this paper, a series of TiO₂ supported vanadium pentoxide and copper oxide catalysts were prepared by the impregnation method for selective catalytic reduction of NO_x with NH₃ at middle-low temperature (200~300℃). The catalysts were characterized by BET and X-ray diffraction (XRD). The results showed that 2V16Cu/TiO₂ calcinated at 500℃ exhibited the best catalytic activity at middle-low temperature and quite wide temperature window. A 97.3% NO_x conversion was obtained at 225℃ and a gross hourly space velocity (GHSV) of 6.0×10⁴h^-1, and it reached 100% at 250~300℃. XRD results showed that the characteristic peak of CuO gradually emerged with the increase of CuO loading. CuO was the key active component of the VCu/TiO₂ catalysts, and affected the catalytic activity at middle-low temperature significantly. The BET results showed that the CuO loading had great influence on surface structure of vanadium-titanium catalyst. The test of sulfur resistance performance showed that 2V16Cu/TiO₂ which was prepared by the introduction of vanadium pentoxide improved its sulfur resistance performance slightly.
- vanadium-copper mixed-oxide /
- selective catalytic reduction /
- middle-low temperature /
- nitrogen oxide /
- ammonia

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