FIELD: chemistry.
SUBSTANCE: exhaust gas treatment systems contain a catalyst for formation of ammonia and oxidation of hydrocarbons, a catalyst TWC and a catalyst for selective catalytic reduction of ammonia (SCR) downstream of a catalyst TWC. Catalyst for formation of ammonia and oxidation of hydrocarbons contains a substrate based on refractory metal oxide, a platinum component and a palladium component. Catalyst for formation of ammonia and oxidation of hydrocarbons is substantially free of cerium dioxide and is substantially free from NOx accumulation components. Components of platinum and palladium are present at a ratio of platinum and palladium of more than about 1 to 1.
EFFECT: exhaust gas processing systems for gasoline exhaust gas flow processing are disclosed.
22 cl, 4 tbl, 17 dwg
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