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US 6,093,378 AGranted
Four-way diesel exhaust catalyst and method of use
AssigneeEngelhard Corporation
InventorsMichel Deeba, Yiu Kwan Lui, Joseph C. Dettling
Life of this patent
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Abstract
A catalyst composition and structure containing the same and methods for treating diesel exhaust including a catalyst comprising a precious metal on a support, a first zeolite component in the presence of a precious metal and a second zeolite component comprising a zeolite and a precious metal, and a non-catalytic pore-containing zeolite.
Claims21
A catalyst comprising:
- a catalyst carrier having a carrier surface;
- a bottom layer on the carrier surface, the bottom layer comprising a first catalyst composition, wherein the first catalyst composition comprises:
- a support component;
- a platinum component located on the support component;
- and
- at least one first zeolite component comprising a zeolite in the substantial absence of a precious metal component;
- and
- a second layer on the bottom layer, the second layer comprising a second catalyst composition, wherein the second catalyst composition comprises:
- at least one second zeolite component comprising a zeolite and a platinum component.
6 more elements
A catalyst comprising:
- a support component;
- a platinum component located on the support component;
- at least one first zeolite component comprising a beta zeolite in the substantial absence of a precious metal component;
- and
- at least one second zeolite component comprising a zeolite and a platinum component.
2 more elements
Dependencies are inferred from the claim text.