Three Way Catalyst Double Impregnation Composition and Method Thereof
First Claim
1. A catalytic converter, comprising:
- a substrate; and
a washcoat on the substrate, comprising an oxide solid selected from the group consisting of at least one of a carrier material oxide and at least one catalyst;
a first impregnation composition, and a second impregnation composition;
wherein the first impregnation composition comprises a material including one or more selected from the group consisting of Ba, Ce, Nd, Sr and Pd, and the second impregnation composition comprises a material including one or more selected from the group consisting of Ba, Ce, Nd, Sr and Pd.
3 Assignments
0 Petitions
Accused Products
Abstract
A double impregnation method and composition for producing three way catalysts (TWC) are disclosed. The TWC may generally include a substrate, a washcoat, a first and second impregnation compositions, and optionally at least an overcoat over the impregnation compositions. The first impregnation composition may include a composition of a perovskite, base metal oxides, and alkaline earth carbonates. The method for applying the first impregnation composition may include combining all base metals in the composition, adding Pd, drying, and adding a heat treatment. The method for applying the second impregnation composition may include adding a remainder of Pd as a Pd solution over the first impregnation, drying, and applying a heat treatment.
18 Citations
34 Claims
-
1. A catalytic converter, comprising:
-
a substrate; and a washcoat on the substrate, comprising an oxide solid selected from the group consisting of at least one of a carrier material oxide and at least one catalyst;
a first impregnation composition, and a second impregnation composition;wherein the first impregnation composition comprises a material including one or more selected from the group consisting of Ba, Ce, Nd, Sr and Pd, and the second impregnation composition comprises a material including one or more selected from the group consisting of Ba, Ce, Nd, Sr and Pd. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method of making a catalytic converter, the method comprising the steps of:
-
providing a substrate; applying a washcoat on the substrate; applying a first impregnation composition on the washcoat; wherein the first impregnation composition includes a perovskite, a base metal oxide, and an alkaline earth carbonate; drying the first impregnation composition; applying heat to the first impregnation composition; applying a second impregnation composition over the first impregnation composition after drying the first impregnation composition; drying the second impregnation composition; and applying heat to the second impregnation composition. - View Dependent Claims (29, 30, 31, 32, 33, 34)
-
Specification