Johnson Matthey Public Limited Company

George Platt

Francois Moreau

David Micallef

Robert Hanley

Christopher Daly

Oliver Cooper

Paul Richard Phillips

Andrew Francis Chiffey

Neil Greenham

Kieran John Cole

Alexander Green

Lee Alexander Gilbert

Caitlin Lucy Jenkins

Jonas Edvardsson

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.

Composite, zoned oxidation catalyst for a compression ignition internal combustion engine

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 ().

Composite, zone-coated, dual-use ammonia (AMOX) and nitric oxide oxidation catalyst

A composite oxidation catalyst for use in an exhaust system for treating an exhaust gas produced by a vehicular compression ignition internal combustion engine is disclosed. The composite oxidation catalyst comprises a honeycomb flow-through substrate monolith and two catalyst washcoat zones arranged axially in series on and along the substrate surface.

Composite, zoned oxidation catalys for a compression ignition internal combustion engine

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.

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Royston, United Kingdom

George Platt