absorber catalyst
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United States of America Patent
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Aug 25, 2015
Grant Date -
Dec 19, 2013
app pub date -
Dec 21, 2011
filing date -
Dec 21, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A NOx absorber catalyst comprising a substrate monolith coated with one or more washcoat layers and comprising a first component comprising a nitrogen oxide storage component, at least one precious metal and a dispersed rare earth oxide supported on a refractory support material, and a second component comprising a precious metal supported on a bulk reducible oxide that is substantially free of nitrogen oxide storage material, wherein the precious metal present in the second component comprises Pt, Pd or a combination of both Pt and Pd and wherein the bulk reducible oxide is an oxide, a composite oxide or a mixed oxide comprising at least one of manganese, iron, cobalt, copper, tin or cerium.
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International Classification(s)
- C01B:NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
- F23J:REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COM....
- F01N:GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHIN....
- B01J:CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, CO....
- C01G:COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLAS....
- B01D:SEPARATION
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