Preparation of Low Temperature and High Activity Mn-V-Ce/TiO_2 Catalyst and Its Catalytic Performance on NO Oxidation

A novel Mn-V-Ce/TiO2 catalyst for catalytic oxidation of nitric oxide was prepared by impregnation method. The effects of loading, carrier, calcining temperature, volume fractions of NO and O2, and space velocity on Mn-V-Ce/TiO2 catalytic oxidation of nitric oxide were studied, and the catalysts were characterized by BET and XRD analysis. The results show that the catalyst from calcination of 10%Mn-3%V2O5-20%CeO2/TiO2 at 300℃ for 6 h can obtain the optimal catalytic oxidation activity. When the volume fraction of NO is 5×10-4(-), O2 10%, space velocity 8000 or 5000 h?1, the oxidation rate (NO2/NOx) reaches 50%～60% at 200 or 175℃, respectively, and the highest absorption efficiency of NOx is gained. At the temperature of 250℃, space velocity 8000 and 5000 h-1, the oxidation rate is about 74% and 86.6%, respectively.