Study On TiO₂, Al₂O₃-based SCR Catalyst And Its DeNOx Performance

Based on experiments and theoretical analyses, the preparation technology of the titanium radicel vanadium department and Ag/Al₂O₃ catalysts had been studied in this paper, also the effects of the factors such as active species and parameter changes during reaction process on the performance of NO removal.The preparation method of the titanium radicel vanadium department and Ag/Al₂O₃ catalysts had been studied, and the value scopes of key parameters for preparation process were given. The influences of the impregnation time, the concentration and the temperature of maceration extract on the loading quality of the catalyst with the graininess cordierite carrier had been researched when we used impregnation method for preparing integral catalyst. The conception of special loading quality was set up, which could make use of the test result extrapolate to the any molding carrier as long as the surface area and the shape were known.The physical-chemical characteristics of the catalysts including the V₂O₅ /TiO₂,V₂O₅-WO/TiO₂,V₂O₅-WO₃-MoO₃/TiO₂ and Ag/Al₂O₃ catalyst with heterogeneity scale were determined by N₂ adsorption, XRD ,ETM, and Electron microscope, and the catalytic activity of each catalyst was investigated in a fix-bed integral reactor. Combined with the characterization results, the effect of the content change of the active constituent and accessory ingredient in the catalyst was analyzed. As a result, it was found that the loading quality of the V₂O₅,MoO₃ and Ag was existing best value.Experimental studies were conducted for different catalysts to verify the characters of resisting SO₂ oxidation. For the titanium radicel vanadium department catalyst, the ability of resisting SO₂ oxidation was relative closely with its components and quantities. The character of V₂O₅ /TiO₂ catalyst was inferior, and the more the quantity of V₂O₅, the more inferior it became. The ability improved some extent by adding WO₃. Furthermore, the ability of V₂O₅-WO₃-MoO₃/TiO₂ catalyst was better remarkably than the former two.Increasing vapor input would debase the activity of both catalysts. When vapor content was added more 10%, the NO conversion decreased about 20%. However, the effect of vapor on Ag/Al₂O₃ catalyst in low temperature was more obviously than that in high temperature.The influence of the reaction temperature, space velocity, input ratio, O₂ concentration and NO initial concentration on catalytic activity was explored. According to the experiment results, the highest active site temperature is 370℃ for V₂O₅-WO₃-MoO₃/TiO₂...