Diesel oxidation catalyst
AssigneeUmicore AG & Co. KG
InventorsElena Mueller, Gordon Keitl, Wulf Hauptmann
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Abstract
The present invention relates to a diesel oxidation catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A and B arranged on the carrier body, wherein material zone A comprises platinum and palladium applied to a cerium-titanium mixed oxide, and material zone B comprises platinum and palladium applied to a carrier oxide B.
Claims20
Diesel oxidation catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A and B arranged on the carrier body, wherein
- material zone A comprises platinum and palladium applied to a cerium-titanium mixed oxide, wherein the cerium-titanium mixed oxide of material zone A to which the platinum and palladium are applied excludes physical mixtures of cerium oxide and titanium oxide, and
- material zone B comprises platinum and palladium applied to a carrier oxide B.
Diesel oxidation catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A and B arranged on the carrier body, wherein
- material zone A comprises platinum and palladium applied to a cerium-titanium mixed oxide, and
- material zone B comprises platinum and palladium applied to a carrier oxide B characterized in that the diesel oxidation catalyst further comprises
- a differently composed material zone C arranged on the carrier body, wherein
- material zone A comprises platinum and palladium in a weight ratio of 1:1 to 1:10 applied to a cerium-titanium mixed oxide comprising 25 to 95% by weight of cerium oxide and 75 to 5% by weight of titanium oxide,
- material zone B comprises platinum and palladium in a weight ratio of 5:1 to 1:1 applied to aluminum oxide or lanthanum-stabilized aluminum oxide, and
- material zone C comprising platinum and/or palladium applied to aluminum oxide doped with 1 to 20% by weight of silica based on the doped aluminum oxide.
Diesel oxidation catalyst comprising a carrier body having a length L extending between a first end face and a second end face, and differently composed material zones A and B arranged on the carrier body, wherein
- material zone A comprises platinum and palladium applied to a cerium-titanium mixed oxide, and
- material zone B comprises platinum and palladium applied to a carrier oxide B, wherein
- material zone A comprises platinum and palladium in a weight ratio of 1:1 to 1:10 applied to a cerium-titanium mixed oxide comprising 25 to 95% by weight of cerium oxide and 75 to 5% by weight of titanium oxide, and
- material zone B comprises platinum and palladium in a weight ratio of 5:1 to 1:1 applied to aluminum oxide or lanthanum-stabilized aluminum oxide.
Dependencies are inferred from the claim text.