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

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 a...

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Bibliographische Detailangaben
Hauptverfasser: Platt, George, Chiffey, Andrew, Phillips, Paul, Micallef, David, Moreau, Francois, Cole, Kieran John, Gilbert, Lee, Daly, Christopher, Hanley, Robert, Cooper, Oliver
Format: Patent
Sprache:eng
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Zusammenfassung: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 L1