Use of a catalyst composition for denitrization and denitrizing catalysts

摘要

A denitrizing catalyst which comprises:(a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides;(b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃, MoO₂, Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and(c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.;Nitrogen oxides contained in waste gases are denitrized effectively by putting the gases into contact with the catalysts in the absence or presence of carbon monoxide as a reducing agent.