Preparation And Study For Mn-Co/TiO₂Series Low Temperature SCO De-nitration Catalyst

SCO de-nitration is an important method to deal with air pollution. Allowing for the lack of SCO de-nitration catalyst, Mn-Co/TiO2catalyst mixed with rare earth element Ce has been studied in this paper. First, the method for preparation is screened, then the preparation process and reaction conditions are optimized. The antisulphur and water resistance also have been investigated. The results show that impregnation method and Sol-gel method are obviously better than coprecipitation method; Mn(0.3)-Co(0.2)/TiO2(550℃) prepared by impregnation method is the best, which could convert80%NO at250"C. This catalyst also has perfect water resistance, but it will be irreversibly inactivated when there is SO2in the reactant. Second, in order to improve the low-temperature activity, antisulphur and water resistance of the catalyst, rare earth element Ce is added into the catalyst. The experiment results show that the addition of Ce could improve the low-temperature activity of the catalyst significantly, the conversion efficiency of NO will be over50%at150℃. At the same time, the Mn-Co-Ce/TiO2catalyst can reach NO conversion efficiency of60%at300℃handled by10%H2O and1000ppmSO2. Finally, based on the optimized graininess catalyst, methods for preparing integral catalyst have been researched. The results show that integral catalyst prepared by impregnation method has a nice activity when the temperature is higher than205℃, but the antisulphur and the water resistance need improvement.