Engine exhaust catalysts containing palladium-gold
AssigneeWGCH Technology Limited
InventorsKyle L. Fujdala, Timothy J. Truex, Juan Cai, Chaitanya Sampara
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Abstract
An emission control catalyst that exhibits improved CO and HC reduction performance includes supported precious group metal catalysts that are coated onto different layers of the substrate for the emission control catalyst. Zeolites of one or more types are added to the emission control catalyst as a hydrocarbon absorbing component to boost the low temperature performance of the emission control catalyst. Y zeolite is used by itself or mixed with other zeolites to enhance hydrocarbon storage at low temperatures.
Claims21
An emission control catalyst comprising a substrate having first, second, and third washcoat layers coated thereon in a multi-layer configuration, wherein the first washcoat layer includes palladium and gold particles in close contact and the third washcoat layer includes supported precious group metal particles and the second washcoat layer is between the first washcoat layer and the third washcoat layer and contains at least Y zeolite.
An emission control catalyst comprising:
- a substrate having first, second, and third washcoat layers coated thereon in a multi-layer configuration, wherein the first washcoat layer comprises supported palladium-gold metal particles, and the third washcoat layer comprises supported platinum-palladium metal particles, and wherein the second washcoat layer contains at least Y zeolite and is between the first washcoat layer and the third washcoat layer.
Dependencies are inferred from the claim text.