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:
Jun. 03, 2025
Filed:
Oct. 16, 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;
Jonas Edvardsson, Vastra Frolunda, SE;
Lee Gilbert, Royston, GB;
Alexander Green, Royston, GB;
Neil Greenham, Royston, GB;
Robert Hanley, Royston, GB;
Caitlin Lucy Jenkins, Royston, GB;
Per Marsh, Vastra Frolunda, SE;
David Micallef, Royston, GB;
Francois Moreau, Royston, GB;
George Platt, Royston, GB;
Paul Richard Phillips, Royston, GB;
James Wylie, Royston, GB;
Johnson Matthey Public Limited Company, London, GB;
Abstract
A composite, zone-coated, dual-use ammonia (AMOX) and nitric oxide oxidation catalyst () 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); two or more catalyst washcoat zones () comprised of a first catalyst washcoat layer () comprising a refractory metal oxide support material and one or more platinum group metal components supported thereon and a second catalyst washcoat layer () different from the first catalyst washcoat layer () and comprising a refractory metal oxide support material and one or more platinum group metal components supported thereon, which two or more catalyst washcoat zones () being 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 one or more platinum group metal components supported thereon; 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 for up to 200% of the axial length of the underlying first catalyst washcoat layer, which washcoat overlayer comprising a particulate metal oxide loading of >48.8 g/l (>0.8 g/in), wherein the particulate metal oxide is an aluminosilicate zeolite including at least one of copper, iron and manganese, 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 different from the total platinum group metal loading in the second catalyst washcoat zone ().