Experimental Study Of Selective Catalytic Reduction Of NO With V₂O₅-WO₃-MoO₃/TiO₂ Catalyst

In this dissertation, we introduce the pollution of NOx and the methods of controlling this pollution problem both here and abroad.The technology of selective catalytic reduction is introduced particularly,including the service condition and reaction mechanism of this technology,and the emphasis of the research direction of these technosphere is expected.The key problem of SCR technology,which is the catalyst of SCR DeNOx system has been researched.Three types of catalysts,they are V₂O₅/TiO₂ ,V₂O₅-WO₃/TiO₂ and V₂O₅-WO₃-MoO₃/TiO₂ which were prepared by ourselves.The physico-chemical characteristics of the catalysts including the V₂O₅ /TiO₂,V₂O₅-WO₃/TiO₂ and V₂O₅-WO₃-MoO₃/TiO₂ catalyst with heterogeneity scale were determined by N₂ adsorption,XRD,ETM,and Electron microscope,and the performance of the catalysts produced were investigated in a fix-bed integral reactor, with the characterization results the effect of the content change of the active constituent and accessory ingredient in the catalyst was analyzed,and we found that the best loading quality of the V₂O₅ and MoO₃ was 3% and 30%.The effect of the reaction temperature,space velocity,input ratio,O₂ concentration and NO initial concentration on NO conversion was explored.The effect of the reaction temperature,space velocity,input ratio,O₂ concentration and NO initial concentration on NO conversion with three kinds of catalysts was similar,when the space velocity was minished or the input ratio O₂ concentration and NO initial concentration increased,the NO conversion would be enhanced. Compared with V₂O₅/TiO₂ and V₂O₅-WO₃/TiO₂ catalyst,the V₂O₅-WO₃-MoO₃/TiO₂ catalyst provided with more thermal stability and better performance of removing NO.