FIELD: chemistry.
SUBSTANCE: invention relates to a catalyst system for reducing nitrogen oxides from exhaust gases containing at least two catalyst layers, wherein the first catalyst layer is an iron-beta-zeolite, and the second catalyst layer lying downstream, is silver which is deposited on aluminium oxide, as well as use of said catalyst system to treat exhaust gases from internal combustion engines operating on diluted mixtures, gas turbines and evaporators. The invention also relates to a method of reducing nitrogen oxides to nitrogen in exhaust gas, which includes passing exhaust gas in the presence of a reducing agent through a catalyst system containing at least two catalyst layers, wherein the first catalyst layer is an iron-beta-zeolite and the second catalyst layer, lying downstream, is silver deposited on aluminium oxide.
EFFECT: improved technological capabilities of removing NOx from exhaust gases.
14 cl, 8 dwg, 3 ex
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