Systems and methods for using Pd;in a TWC
First Claim
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1. A catalyst system, comprising:
- a substrate; and
a washcoat deposited on the substrate, comprising at least one metal oxide carrier, and at least one catalyst; and
wherein the at least one catalyst comprises at least one perovskite structured compound having the formula ABO3 wherein A is selected from the group consisting of Palladium (I), Palladium (I)/Calcium, Lanthanum and combinations thereof, and B is selected from the group consisting of Titanium/Niobium, Niobium, Zirconium, Manganese, Tantalum, Vanadium, Titanium, Tungsten and combinations thereof; and
wherein the washcoat further comprises at least one oxygen storage material.
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Abstract
Stabilized palladium (+1) compounds to mimic rhodium'"'"'s electronic configuration and catalytic properties are disclosed. Palladium (+1) compounds may be stabilized in perovskite or delafossite structures and may be employed in Three-Way Catalysts (TWC) for at least the conversion of HC, CO and NOx, in exhaust gases. The TWC may include a substrate, a wash-coat and, a first impregnation layer, a second impregnation layer and an over-coat. The second impregnation layer and the over-coat may include palladium (+1) based compounds as catalyst.
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Citations
20 Claims
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1. A catalyst system, comprising:
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a substrate; and a washcoat deposited on the substrate, comprising at least one metal oxide carrier, and at least one catalyst; and wherein the at least one catalyst comprises at least one perovskite structured compound having the formula ABO3 wherein A is selected from the group consisting of Palladium (I), Palladium (I)/Calcium, Lanthanum and combinations thereof, and B is selected from the group consisting of Titanium/Niobium, Niobium, Zirconium, Manganese, Tantalum, Vanadium, Titanium, Tungsten and combinations thereof; and wherein the washcoat further comprises at least one oxygen storage material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A catalyst system, comprising:
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a substrate; and a washcoat deposited on the substrate, comprising at least one metal oxide carrier, and at least one catalyst; and wherein the at least one catalyst comprises at least one delafossite structured compound having the formula ABO2 wherein A is Palladium (I) and B is selected from the group consisting of Scandium, Chromium, Manganese, Iron, Cobalt, Gallium, Aluminum and combinations thereof. - View Dependent Claims (17, 18, 19, 20)
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Specification