Palladium/zeolite-based passive nitrogen oxide adsorber catalyst for purifying exhaust gas
AssigneeUmicore AG & Co. KG
InventorsChristoph Hengst, Frank-Walter Schuetze, Michael Lennartz
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Abstract
The invention relates to a catalyst which comprises a carrier substrate, palladium, and a zeolite, the largest channels of which are formed by 10 tetradrically coordinated atoms; to the use of said catalyst as a passive nitrogen oxide adsorber, an exhaust gas system which contains said catalyst and an SCR catalyst, and to a method for purifying the exhaust gas of motor vehicles using said exhaust gas system.
Claims20
Catalyst comprising a carrier substrate of length L and a composition that is composed of palladium and a zeolite whose largest channels are formed by 10 tetrahedrally coordinated atoms, and wherein the composition has no zeolite whose largest channels are not formed by 10 tetrahedrally coordinated atoms.
A catalyst comprising a carrier substrate of length L and a coating applied on the carrier substrate, with the coating having a composition that is composed of palladium and a zeolite whose largest channels are formed by 10 tetrahedrally coordinated atoms, and wherein the coating has no zeolite whose largest channels are not formed by 10 tetrahedrally coordinated atoms.
Dependencies are inferred from the claim text.