FIELD: process engineering.
SUBSTANCE: proposed catalyst allows catalytic removal of nitrogen oxides in using ammonia as reducing agent, on decomposing and removing unreacted ammonia containing porous basic catalyst material. The latter contains titanium oxide and at least one compound selected from the group consisting of vanadium oxides, tungsten oxides and molybdenum oxides, and cover layer formed on the surface of said basic catalyst material and comprising platinum applied on titanium oxide. Proposed system catalytically removes nitrogen oxides from exhaust gas by using ammonia as reducing agent with simultaneous decomposition and removal of unreacted ammonia wherein denitrating catalyst DeNOx is located uprteam of gas flow, while above described exhaust gas catalyst is located downstream of catalyst DeNOx.
EFFECT: reduced leaks of ammonia, efficient removal of nitrogen oxides and reduced cover layer thickness.
5 cl, 1 tbl, 4 ex
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