Thermally stable compositions of OSM free of rare earth metals
First Claim
1. A catalytic composition, comprising:
- an oxygen storage material, comprising;
Cu—
Mn spinel and Niobium-Zirconia support oxide dried and calcined at about 600°
C.;
wherein the oxygen storage material is hydrothermally aged.
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Accused Products
Abstract
The effect of aging temperature on oxygen storage materials (OSM) substantially free from platinum group (PGM) and rare earth (RE) metals is disclosed. Samples of ZPGM-ZRE metals OSM, hydrothermally aged at a plurality of high temperatures are found to have significantly high oxygen storage capacity (OSC) and phase stability than conventional PGM catalysts with Ce-based OSM. ZPGM-ZRE metals OSM includes a formulation of Cu—Mn stoichiometric spinel structure deposited on Nb—Zr oxide support and may be converted into powder to be used as OSM application or coated onto catalyst substrate. ZPGM-ZRE metals OSM, after aging condition, presents enhanced level of thermal stability and OSC property which shows improved catalytic activity than conventional PGM catalysts including Ce-based OSM. ZPGM-ZRE metals OSM may be suitable for a vast number of applications, and more particularly in underfloor catalyst systems.
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Citations
17 Claims
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1. A catalytic composition, comprising:
-
an oxygen storage material, comprising; Cu—
Mn spinel and Niobium-Zirconia support oxide dried and calcined at about 600°
C.;wherein the oxygen storage material is hydrothermally aged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification