V_2O_5-CuO/TiO_2催化剂中低温选择性催化NO_x还原研究  

Selective catalytic reduction of NO_x on V_2O_5-CuO/TiO_2 catalyst at middle-low temperature

作　　者：陈志航[1] 晏萍[2] 唐志雄[1] 岑超平[1] 陈定盛[1] 方平[1] 罗建中[2] 

机构地区：[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

出　　处：《燃料化学学报》2012年第4期469-474,共6页Journal of Fuel Chemistry and Technology

基　　金：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)

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NOx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,NOx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。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 NOx 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% NOx conversion was obtained at 225 ℃ and a gross hourly space velocity（GHSV） of 6.0×104 h-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.

关 键 词：钒铜复合氧化物 选择性催化还原 中低温 氮氧化物 氨 

分 类 号：O643.3[理学—物理化学]