Method of selective catalytic purification of waste gases from nitrogen oxides

摘要

The method of selective catalytic purification of waste gases from nitrogen oxides consists in that the waste gas to be treated is passed, together with gaseous ammonia, through the bed of a catalyst at a temperature of 100 DEG -500 DEG C, a volumetric velocity of the waste gas of 5000 - 100000 hour-1 and a volumetric ratio of ammonia to nitrogen oxides of 0.7 - 1.5. The catalyst used in the proposed method is actually oxides of vanadium and of manganese that are taken in the weight ratio V2O5/Mn2O3 of 0.1 - 30, the total quantity of the metal oxides being from 5 to 40 percent with respect to the total weight of the catalyst.