Experimental study on Mn-doped VWTi catalyst for denitrification in wide temperature range

A series of manganese-doped VWTi catalysts were prepared by the sol-gel method, and the denitrification performance of the catalysts in a wide temperature range was tested on a fixed bed reactor to examine the influences of catalyst preparation process, flue gas components, reaction temperature, gas hourly space velocity on denitrification activity of the catalyst. The catalyst was characterized and analyzed by means of BET, XRD, XPS, SEM and H₂-TPR. The results show that Mn doping significantly improves the denitrification efficiency of the catalyst in the range of 200–300 ℃, and a lower drying temperature is beneficial to improve the denitrification activity of the catalyst. The characterization results of the catalyst show that with the drying temperature increase, the TiO₂ on the catalyst surface changes from anatase crystal form to rutile crystal form, the proportion of chemically adsorbed oxygen on the surface of the catalyst is significantly reduced, the proportion of high valence manganese is reduced, the proportion of manganese and vanadium as the active components of the catalyst surface is significantly reduced, and the low-temperature reduction peak of the catalyst gradually disappears. These all reduce the catalytic oxidation activity of catalysts.