Zero-PGM Catalyst with Oxygen Storage Capacity for TWC Systems
AssigneeCdti
InventorsZahra Nazarpoor, Stephen J. Golden
Life of this patent
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Abstract
ZPGM-ZRE catalyst system substantially free from platinum group (PGM) and rare earth (RE) metals for TWC application is disclosed. Disclosed ZPGM-ZRE catalyst system may include pure alumina as washcoat and a Cu—Mn stoichiometric spinel with Nb2O5—ZrO2 support oxide, as ZPGM-ZRE catalyst in overcoat. Disclosed ZPGM-ZRE catalyst systems are found to have high thermal stability, catalyst activity, and high oxygen storage capacity compared to commercial PGM catalyst system that includes Ce-based oxygen storage material (OSM).
Claims24
A catalyst system, comprising:
- a substrate;
- a washcoat;
- an overcoat comprising at least one oxygen storage material is substantially free of platinum group metals and rare earth metals;
- and
- wherein the at least one oxygen storage material comprises Cu—Mn spinel having a niobium-zirconia support oxide;
- and
- wherein the washcoat comprises Al2O3.
The catalyst system of claim 23, wherein the conversion of NO and HC is about 65%.
Dependencies are inferred from the claim text.