Claims
- 1. An OIC/OS material, based upon 100 mole % metal component in the material, comprising:
about 0.5 to about 95 mole percent (mole %) zirconium; about 0.5 to about 40 mole % cerium; about 0.5 to about 15 mole % R, wherein R is selected from the group consisting of rare earth metal(s), alkaline earth metal(s), and combinations comprising at least one of the foregoing; and about 0.5 to about 15 mole % niobium.
- 2. An OIC/OS material as in claim 1, further comprising about 0.5 to about 90 mole % zirconium; about 0.5 to about 35 mole % cerium; about 1 to about 12 mole % R, and about 1 to about 12 mole % niobium.
- 3. An OIC/OS material as in claim 2, further comprising about 50 to about 85 mole % zirconium; about 10 to about 30 mole % cerium; about 2 to about 11 mole % R, and about 2 to about 11 mole % niobium.
- 4. An OIC/OS material as in claim 1, wherein said R and said niobium are present in substantially equimolar amounts.
- 5. An OIC/OS material as in claim 1, wherein R is selected from the group consisting of yttrium, magnesium, calcium, strontium, lanthanum, praseodymium, neodymium, and combinations comprising at least one of these metals.
- 6. An OIC/OS material as in claim 1, wherein the OIC/OS material further has a substantially pure cubic crystal structure under reducing conditions, and a substantially pure tetragonal crystal structure under oxidizing conditions.
- 7. An OIC/OS material, based upon 100 mole % metal component in the material, comprising the reaction product of:
about 0.5 to about 95 mole percent (mole %) zirconium; about 0.5 to about 40 mole % cerium; about 0.5 to about 15 mole % R, wherein R is selected from the group consisting of rare earth metal(s), alkaline earth metal(s), and combinations comprising at least one of the foregoing; and about 0.5 to about 15 mole % niobium.
- 8. An OIC/OS material as in claim 7, wherein said R and said niobium are present in substantially equimolar amounts.
- 9. An OIC/OS material as in claim 7, wherein R is a rare earth metal, alkaline earth metal, or a combination comprising at lest one of the foregoing metals, with yttrium, magnesium, calcium, strontium, lanthanum, praseodymium, neodymium, and combinations comprising at least one of these metals.
- 10. An OIC/OS material as in claim 9, further comprising about 50 to about 85 mole % zirconium; about 10 to about 30 mole % cerium; about 2 to about 11 mole % R, and about 2 to about 11 mole % niobium.
- 11. An OIC/OS material as in claim 1, wherein the precious metal is selected from the group consisting of platinum, palladium, iridium, osmium, rhodium, ruthenium, and mixtures comprising one or more of the foregoing precious metals.
- 12. An OIC/OS material as in claim 1, wherein the support comprises a high surface area alumina.
- 13. An OIC/OS material as in claim 1, wherein the OIC/OS material further has a substantially pure cubic crystal structure under reducing conditions, and a substantially pure tetragonal crystal structure under oxidizing conditions.
- 14. An OTC/OS material as in claim 2, wherein said R and said niobium are present in substantially equimolar amounts.
- 15. An OIC/OS material as in claim 1, further comprising about 50 to about 85 mole % zirconium, about 10 to about 30 mole % cerium, about 2 to about 11 mole % R, and about 2 to about 11 mole % niobium.
- 16. An OIC/OS material as in claim 15, wherein R comprises yttrium.
- 17. A solid solution, based upon 100 mole % metal component in the solution, comprising the reaction product of: 50 to about 85 mole % zirconium, about 10 to about 30 mole % cerium, about 2 to about 11 mole % R, wherein R is selected from the group consisting of rare earth metal(s), alkaline earth metal(s), and combinations comprising at least one of the foregoing, and about 2 to about 11 mole % niobium.
- 18. A solid solution as in claim 17, wherein the niobium and R are present in substantially equivalent amounts.
- 19. A solid solution as in claim 18, wherein R comprises yttrium.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a divisional application of U.S. patent application Ser. No. 09/690,511, filed Oct. 17, 2000, which is hereby incorporated by reference in its entirety.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09690511 |
Oct 2000 |
US |
Child |
10195928 |
Jul 2002 |
US |