The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2025
Filed:
Oct. 13, 2020
Johnson Matthey Public Limited Company, London, GB;
Andrew Francis Chiffey, Royston, GB;
Kieran Cole, Royston, GB;
Oliver Cooper, Royston, GB;
Christopher Daly, Royston, GB;
Lee Alexander Gilbert, Royston, GB;
Robert Hanley, Royston, GB;
David Micallef, Royston, GB;
Francois Moreau, Royston, GB;
Paul Phillips, Royston, GB;
George Platt, Royston, GB;
Johnson Matthey Public Limited Company, London, GB;
Abstract
A compression ignition internal combustion engine () for a heavy-duty diesel vehicle comprising an exhaust system () comprising a composite oxidation catalyst () and a soot filter substrate () disposed downstream from the composite oxidation catalyst comprising: a substrate (), preferably a honeycomb flow-through substrate monolith, having a total length L and a longitudinal axis and having a substrate surface extending axially between a first substrate end (I) and a second substrate end (O); two catalyst washcoat zones () arranged axially in series on and along the substrate surface, wherein a first catalyst washcoat zone () having a length Land comprising a first catalyst washcoat layer (), wherein L<L, is defined at one end by the first substrate end (I) and at a second end by a first end () of a second catalyst washcoat zone () having a length Land comprising a second catalyst washcoat layer (), wherein L<L, wherein the second catalyst washcoat zone () is defined at a second end thereof by the second substrate end (O), and wherein the first substrate end (I) of the composite oxidation catalyst () is oriented to an upstream side and wherein the first catalyst washcoat zone () comprises a first refractory metal oxide support material and two or more platinum group metal components supported thereon comprising both platinum and palladium at a weight ratio of platinum to palladium of <1; and the second catalyst washcoat zone () comprises a second refractory metal oxide support material and one or more platinum group metal components supported thereon; and a washcoat overlayer (G) extending axially from the first substrate end (I) comprising a particulate metal oxide having a loading of >48.8 g/l (>0.8 g/in), wherein a total platinum group metal loading in the first catalyst washcoat zone () defined in grams of platinum group metal per litre of substrate volume (g/l) is greater than a total platinum group metal loading in the second catalyst washcoat zone () and wherein the first catalyst washcoat zone () comprises one or more first alkaline earth metal components, preferably barium, supported on the first refractory metal oxide support material.