Effects of components of SCR catalyst on DeNO_x performance

A SCR catalyst was prepared with active components impregnation on the TiO₂ made by sol-gel method. With TiO₂ as the carrier, the effects of WO₃ and V₂O₅ contents and SiO₂ and Al₂O₃ addition on the DeNO_x performance were investigated. It is demonstrated that the addition of SiO₂ and Al₂O₃ can depress the DeNO_x performance and 0.5%V₂O₅~10%WO₃/TiO₂ is the optimum catalyst within the investigating range. Compared with the commercialized catalyst that is mostly prepared by mixing uniform anatase TiO₂ powder and glass fibers with binding to mold certain-shape support and then impregnating active components on the support, the catalyst of 0.5%V₂O₅~10%WO₃/TiO₂ shows an excellent NO removal efficiency below 603K, while the commercialized one shows more than 90% of DeNO_x efficiency at 603K~663K, which can be attributed to the differences of preparation method and components.