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An alumina-based perovskite is formed by mixing a lanthanide source with a transitional alumina to form a dual-phase composition comprising in-situ formed LnAlO3 dispersed in alumina. The lanthanide content of the composition ranges from 6-35 wt. % to yield a high surface area composition which is u

An alumina-based perovskite is formed by mixing a lanthanide source with a transitional alumina to form a dual-phase composition comprising in-situ formed LnAlO3 dispersed in alumina. The lanthanide content of the composition ranges from 6-35 wt. % to yield a high surface area composition which is useful as a catalyst or catalyst support such as for precious metals.

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What is claimed is: 1. An alumina-based perovskite composition comprising a dual-phase system of alumina and in-situ formed LnAlO3 perovskite dispersed in said alumina, said perovskite comprising at least 9 wt. % of said composition, wherein Ln is a lanthanide element. 2. The composition of claim

What is claimed is: 1. An alumina-based perovskite composition comprising a dual-phase system of alumina and in-situ formed LnAlO3 perovskite dispersed in said alumina, said perovskite comprising at least 9 wt. % of said composition, wherein Ln is a lanthanide element. 2. The composition of claim 1 wherein the lanthanide content of said composition is about 6-35 wt. %. 3. The composition of claim 1 wherein Ln is lanthanum. 4. The composition of claim 3 wherein the lanthanum content of said composition is about 12-24 wt. %. 5. The composition of claim 1 having a BET surface area of greater than 20 m2/g. 6. The composition of claim 1 further containing a precious metal comprising 0.5-5 wt. % of the composition. 7. The composition of claim 6 wherein the precious metal is selected from platinum, palladium, and rhodium. 8. The composition of claim 1 wherein all or part of the aluminum sites in the perovskite are replaced with a metal other than Al. 9. A method of catalyzing a chemical reaction comprising contacting at least one chemical reactant with the composition of claim 1 having optionally incorporated therein a catalytic metal. 10. A method of forming an alumina-based perovskite composition comprising: mixing a source of lanthanide and alumina to form a mixture, the amount of lanthanide comprising from about 6-35 wt. % of the composition, and heating said mixture at a temperature of about 900�� C. to under 1100�� C. for 0.5-8 hours to form a composition comprising in-situ formed LnAlO3 perovskite dispersed in alumina, wherein Ln is a lanthanide element. 11. The method of claim 10 wherein Ln is lanthanum. 12. The method of claim 11 wherein said lanthanum comprises 12-24 wt. % of said formed composition. 13. The method of claim 10 wherein said source of alumina is a transitional alumina. 14. The method of claim 13 wherein said transitional alumina comprises boehmite, pseudoboehmite, gamma-alumina, aluminum trihydroxide, and rho-alumina. 15. The method of claim 10 comprising mixing a solid alumina with either a liquid or solid source of lanthanide. 16. The method of claim 15 wherein said lanthanide source is a lanthanide salt dissolved in water. 17. The method of claim 15 wherein said lanthanide source is a solid lanthanide oxide or salt. 18. The method of claim 10 wherein a precious metal is mixed with said lanthanide source and said alumina, and said precious metal comprises from 0.5-5 wt. % of the formed composition. 19. The method of claim 10 wherein all or part of the aluminum sites in said perovskite are replaced with a metal other than Al. 20. The method of claim 10 wherein a precious metal is impregnated into the formed alumina-based perovskite composition.