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

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United States of America Patent

PATENT NO 11845064
SERIAL NO

17594694

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Abstract

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A composite oxidation catalyst (18, 20) for use in an exhaust system for treating an exhaust gas produced by a vehicular compression ignition internal combustion engine (30) and upstream of a particulate matter filter (44, 50) in the exhaust system comprises a substrate (5) 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 (1, 2, 3; or 1, 2, 3, 4) arranged axially in series on and along the substrate surface, wherein a first catalyst washcoat zone (1) having a length L1, wherein L119, 21) of a second catalyst washcoat zone (2) having a length L2, wherein L21) 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 (2) comprises a second refractory metal oxide support material and one or more platinum group metal components supported thereon; and a third catalyst washcoat zone (3) 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 (1) defined in grams of platinum group metal per cubic foot of substrate volume (g/l) (g/ft3) is greater than a total platinum group metal loading in the second catalyst washcoat zone (2), wherein a total platinum group metal loading in the third catalyst washcoat zone (3) defined in grams of platinum group metal per cubic foot of substrate volume (g/l) (g/ft3) is less than the total platinum group metal loading in the second catalyst washcoat zone (2) and wherein the first catalyst washcoat zone (1) comprises one or more first alkaline earth metal components supported on the first refractory metal oxide support material.

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Patent Owner(s)

Patent OwnerAddress
JOHNSON MATTHEY PUBLIC LIMITED COMPANY25 FARRINGDON STREET 5TH FLOOR LONDON EC4A 4AB

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chiffey, Andrew Royston, GB 17 18
Cole, Kieran John Royston, GB 5 35
Cooper, Oliver Royston, GB 15 15
Daly, Christopher Royston, GB 49 414
Gilbert, Lee Royston, GB 3 44
Hanley, Robert Royston, GB 9 43
Micallef, David Royston, GB 23 112
Moreau, Francois Royston, GB 62 303
Phillips, Paul Royston, GB 83 1418
Platt, George Royston, GB 7 16

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