FIELD: engines and pumps.
SUBSTANCE: invention relates to a catalysed filter for filtering particulate matter from exhaust gas emitted from a positive ignition internal combustion engine. Positive ignition engine comprises an exhaust system, which comprises a catalysed filter for filtering particulate matter from exhaust gas emitted from a positive ignition internal combustion engine, where in said filter, the sum of the substrate length in the first zone and the substrate length in the second zone is ≥ 100 % of the full substrate length, wherein: (i) a washcoat loading in the first zone is greater than in the second zone; or (ii) where the washcoat composition is NOx absorber catalyst washcoat composition, both a washcoat loading and the total precious metal loading in the first zone is greater than in the second zone, and wherein the first zone is located upstream of the second zone.
EFFECT: reduction of the total volume of components of the exhaust system.
17 cl, 3 dwg, 3 tbl
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