FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry for reduction of nitrogen oxides to nitrogen in waste gas. Waste gas is passed through catalytic system, which contains, at least, two layers of catalyst, in presence of oxygen-containing reducing agent. The first catalyst layer contains only aluminium oxide, and the second layer, which is located lower, contains only indium or indium oxide on aluminium oxide carrier.
EFFECT: claimed combination of separate catalysts in one catalytic system ensures increase in degree of conversion of nitrogen oxides (NOx) in comparison with each of separate catalysts and creates possibility of extending temperature interval of efficient catalyst action.
10 cl, 2 dwg
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