Composite zoned oxidation catalyst for compression ignition internal combustion engine

• Main Authors: HANLEY ROBERT, COLE KIERAN, PHILLIPS PAUL, CHIFFEY ANDREW, MOREAU FRANCOIS, GILBERT LAURENCE, PLATTE GABRIELE, COOPER OLIVER, MICALLEF DAVID, DALY CHRISTOPHER
• Format: Patent
• Language: Chinese; English
• Published: 21.11.2023
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

A composite oxidation catalyst for treating exhaust gas produced by a compression ignition internal combustion engine of a vehicle in an exhaust system includes a substrate having two catalyst washcoat regions arranged in series axially on and along a substrate surface, where a first catalyst washcoat region includes a first catalyst washcoat, and a second catalyst washcoat region includes a second catalyst washcoat. And having a lt of the axial length L of the substrate; a second catalyst washcoat region having a length of 50% and defined at one end by the first substrate end and at a second end by a first end of the second catalyst washcoat region, the second catalyst washcoat region defined at its second end by the second substrate end and having a length of less than L and comprising a second catalyst washcoat; wherein the composite oxidation catalyst comprises a washcoat overlay extending axially from the first substrate end to an axial length gt of the underlying first catalyst washcoat; 50% to 150% at