Thermally stable oxygen storage material (osm) and method of making the same
AssigneePacific Industrial Development Corporation
InventorsGeng Zhang, Anatoly Bortun, Mila Bortun, Benjamin Brown, Yunkui Li, David Shepard, Jeffery Lachapelle
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Abstract
An oxygen storage material (OSM) that includes zirconium oxide, aluminum oxide, cerium oxide, and an oxide of at least one rare earth metal other than cerium is provided. This oxygen storage material remains thermally stable after ageing at 1, 100° C. for at least 6 hours without the occurrence of any phase segregation and/or disproportionation.
Claims20
An oxygen storage material (OSM) comprising zirconium oxide, aluminum oxide, cerium oxide, and an oxide of at least one rare earth metal other than cerium,
- wherein the OSM remains thermally stable after ageing at 1,100° C. for at least 6 hours without any phase segregation and/or disproportionation.
A method of making a thermally stable oxygen storage material (OSM), the method comprising the steps of:
- (a) Preparing an acidic solution containing polymerized zirconium oligomers;
- (b) Mixing an alumina source with the acidic solution containing the polymerized zirconium oligomers to form a mixture;
- (c) Mixing a complexing agent into the mixture;
- (d) Allowing the mixture to form a zirconium-aluminum-based precursor;
- (e) Adding a base to the zirconium-aluminum-based precursor in order to neutralize the zirconium-aluminum-based precursor and form a zirconium-aluminum-based hydrous oxide slurry;
- (f) Mixing the zirconium-aluminum-based hydrous oxide slurry with an acidic solution containing cerium and at least one rare earth metal other than cerium to form a polyvalent metal containing slurry;
- (g) Ageing the polyvalent metal containing slurry at a pH that is higher than 10 in order to allow the formation of a mixed hydrous oxide precipitate;
- (h) Washing the mixed hydrous oxide precipitate from anionic and/or cationic admixtures;
- (i) Drying the washed mixed hydrous oxide precipitate;
- and
- (j) Calcining the dry mixed hydrous oxide precipitate to form the oxygen storage material (OSM);
- wherein the OSM is thermally stable after ageing at 1,100° C. for at least 6 hours without the occurrence of any phase segregation and/or disproportionation.
Dependencies are inferred from the claim text.