catalytic filter, exhaust system for a positive-ignition internal combustion engine, positive-ignition engine, and method for simultaneously converting carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter into the exhaust gas of an internal combustion engine positive ignition

摘要

1/2 summary “catalyzed filter, positive ignition engine, and method for simultaneously converting carbon monoxide, hydrocarbons, nitrogen oxides and particulate matter in the exhaust gas of a Positive Ignition Internal Combustion Engine A catalyzed filter for filtering particulate matter from exhaust gases emitted from a positive ignition internal combustion engine comprises a porous substrate having a total substrate length and having inlet surfaces and outlet surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a porous structure containing pores of a first medium pore size, wherein The porous substrate is coated with a washable three-way catalyst coating composition comprising at least one precious metal selected from the group consisting of (i) platinum and radio; (ii) palladium and radio; and (iii) platinum, palladium and radium, supported on a large surface area oxide, and an oxygen storage component, wherein the porous structure of the wash-coated porous substrate contains pores of one second. medium pore size, wherein the second medium pore size is smaller than the first medium pore size, three-way catalyst wash coating which is arranged axially on the porous substrate between a first zone comprising the inlet surfaces of a first substrate length less than the total substrate length and a second zone comprising the outlet surfaces of a second substrate length less than the total substrate length, wherein the sum of the substrate length in the first zone and the substrate length in the second zone â ‰ ¥ 100% and where: (i) a wash coating loading in the first zone is greater than in the following in the zone; (ii) a 2/2 total precious metal load in the first zone larger than in the second zone; or (iii) either a wash coating load or a total precious metal load in the first zone larger than in the second zone.