PbO对V_2O_5/TiO_2催化剂NH_3选择性催化还原NO的影响  

THE EFFECT OF PbO ON A V_2O_5/TiO_2 CATALYST FOR SELECTIVE CATALYTIC REDUCTION OF NO WITH NH3

作　　者：姜烨[1] 高翔[1] 杜学森[1] 毛剑宏[1] 骆仲泱 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《工程热物理学报》2009年第11期1973-1976,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776079);国家863高技术基金项目(No.2007AA061802);教育部新世纪优秀人才支持计划资助项目(No.NCET-06-0513);浙江省重大科技专项重点项目(No.2006C13074);浙江省优先主题计划项目(No.2007AA061802)

摘　　要：基于铅在中国燃煤和MSW焚烧烟气中的特点,采用静态N_2物理吸附、NH_3化学吸附、程序升温表面反应、傅里叶变换红外光谱和催化剂活性评价的方法,研究了PbO对1 wt.%V_2O_5/TiO_2催化剂NH_3选择性催化还原NO的影响。结果表明,PbO使SCR催化剂活性降低。对于燃煤锅炉,PbO对V_2O_5/TiO_2催化剂的影响可以忽略不计;对于MSW焚烧炉,PbO是使V_2O_5/TiO_2催化剂失活的重要铅化合物。Pb覆盖在TiO_2表面上,与V活性位覆盖在TiO_2表面上的方式类似。催化剂的失活主要是由于PbO中和了催化剂表面Brφnsted酸性位的酸性,Brφnsted酸性位对于NH_3的吸附和活化起重要作用。Based on the characteristics of lead in flue gas from Chinese coal and MSW-fired plants, the effect of PbO on 1 wt.% V2O5/TiO2 catalyst for selective catalytic reduction of NO with NH3 is studied using static N2 physical adsorption, NHa chemisorption, temperature-programmed surface reaction, Fourier transform infrared spectroscopy and activity measurement. The results show that PbO deactivates the V2O5/TiO2 catalysts. For the V2O5/TiO2 catalysts used in coal-fired plants the effect of PbO can be neglected, while PbO is an important poison for V2O5/TiO2 catalysts in MSW-fired applications. Pb covers the surface of TiO2 sites, similar to active V sites. The deactivation is mainly caused by neutralization of the Brφnsted acid sites on the surface of a V2O5/TiO2 catalyst, which plays a key role on the absorption and activation of NH3.

关 键 词：选择性催化还原 V2O5/TIO2催化剂 PBO 活性 

分 类 号：X511[环境科学与工程—环境工程]