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:
Dec. 19, 2023
Filed:
Jun. 26, 2020
Johnson Matthey Public Limited Company, London, GB;
Andrew Chiffey, Royston, GB;
Kieran John Cole, Royston, GB;
Oliver Cooper, Royston, GB;
Christopher Daly, Royston, GB;
Lee Gilbert, Royston, GB;
Robert Hanley, Royston, GB;
David Micallef, Royston, GB;
Francois Moreau, Royston, GB;
Paul Phillips, Royston, GB;
George Platt, Royston, GB;
Abstract
A composite oxidation catalyst () for use in an exhaust system for treating an exhaust gas produced by a vehicular compression ignition internal combustion engine () and upstream of a particulate matter filter () in the exhaust system comprises a substrate () 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); and three or more catalyst washcoat zones (; or) arranged axially in series on and along the substrate surface, wherein a first catalyst washcoat zone () having a length L, 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 L, wherein L<L, 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; 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 third catalyst washcoat zone () comprising a third refractory metal oxide support material and one or more platinum group metal components supported thereon is defined at a second end thereof by the second substrate end (O), wherein a total platinum group metal loading in the first catalyst washcoat zone () defined in grams of platinum group metal per cubic foot of substrate volume (g/l) (g/ft) is greater than a total platinum group metal loading in the second catalyst washcoat zone (), wherein a total platinum group metal loading in the third catalyst washcoat zone () defined in grams of platinum group metal per cubic foot of substrate volume (g/l) (g/ft) is less than the 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 supported on the first refractory metal oxide support material.