catalytic filter, exhaust system for positive-ignition internal combustion engine, positive-ignition engine, vehicle, simultaneous conversion of nitrogen oxides and particulate matter

摘要

1/1 overview “catalyzed filter, exhaust system for a positive-ignition internal combustion engine, positive-ignition engine, vehicle, simultaneous conversion of nitrogen oxides and A catalyzed filter for filtering particulate matter from exhaust gas emitted from a positive-ignition internal combustion engine comprises a ceramic porous filter substrate. wall flow having a total substrate length and having inlet channels defined in part by inlet wall ceramic surfaces and in defined outlet channels in part of the outlet wall ceramic surfaces in that the inlet surfaces are separated from the outlet surfaces by a first porous structure containing pores of a first medium pore size, wherein the porous substrate is coated in part with a composition. reactive catalyst coating wherein a second porous structure of a reactive coated portion of the porous substrate contains pores of a second medium pore size, wherein the second medium pore size is smaller than that the first medium pore size, the reactive coating composition of the catalyst is disposed in a first zone comprising the inlet surfaces of a first substrate length less than the total substrate length, wherein a The second zone comprising the exit surfaces of a second substrate length contains no reactive coating and wherein the sum of the substrate length in the first zone and the substrate length in the second zone is 100%.