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US 12,539,493 B2Granted
Catalyst for the abatement of ammonia and nitrogen oxide emissions from the exhaust gases of combustion engines
AssigneeUmicore AG & Co. KG
InventorsMassimo Colombo, Michael Seyler
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Abstract
The present invention relates to a catalyst comprising a carrier substrate of the length L, which extends between a first end face ‘a’ and a second end face ‘b’, and differently composed material zones A and B arranged on the carrier substrate, wherein material zone A comprises platinum and no palladium or platinum and palladium with a weight ratio of Pt:Pd of ≥1 and, material zone B comprises a copper containing zeolite having a Cu/Al ratio of 0.355 or higher.
Claims22
Catalyst comprising
- a carrier substrate of the length L, which extends between a first end face ‘a’ and a second end face ‘b’, and
- differently composed material zones A and B arranged on the carrier substrate, wherein
- material zone A comprises platinum and no palladium or platinum and palladium with a weight ratio of Pt:Pd of ≥1 and,
- material zone B comprises a copper containing zeolite having a Cu/Al ratio of 0.4 to 2, and wherein
- material zone A comprises platinum in the form of platinum particles, wherein the platinum particles have an average diameter of 50-200 nm.
2 more elements
Dependencies are inferred from the claim text.