FIELD: gas treatment. SUBSTANCE: invention aims at purifying gases from chemical and fuel-and-energy processes as well as vehicle gas exhausts to reduce emission of nitrogen oxides and incomplete-combustion products into atmosphere. Gas is treated in two steps on block high-porosity catalysts: gas is first oxidized on perovskite-based oxide catalyst and then reduced on catalyst based on modified zeolite while simultaneously adding water- soluble NH-containing reducing agents. EFFECT: enhanced process efficiency and enabled treatment of exhaust gases from cold engine. 10 cl, 6 tbl
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