초록 ▼

The present invention is a mixed oxide solid solution containing a tetravalent and a pentavalent cation that can be used as a support for a metal combustion catalyst. The invention is furthermore a combustion catalyst containing the mixed oxide solid solution and a method of making the mixed oxide s

The present invention is a mixed oxide solid solution containing a tetravalent and a pentavalent cation that can be used as a support for a metal combustion catalyst. The invention is furthermore a combustion catalyst containing the mixed oxide solid solution and a method of making the mixed oxide solid solution. The tetravalent cation is zirconium(+4), hafnium(+4) or thorium(+4). In one embodiment, the pentavalent cation is tantalum(+5), niobium(+5) or bismuth(+5). Mixed oxide solid solutions of the present invention exhibit enhanced thermal stability, maintaining relatively high surface areas at high temperatures in the presence of water vapor.

대표청구항 ▼

1. A monolithic catalytic combustion catalyst comprising: a metal support; a mixed oxide support comprising a pentavalent cation and a member selected from the group consisting of zirconium, hafnium and thorium, wherein the mixed oxide support has a surface area of greater than about 10 m2/g at

1. A monolithic catalytic combustion catalyst comprising: a metal support; a mixed oxide support comprising a pentavalent cation and a member selected from the group consisting of zirconium, hafnium and thorium, wherein the mixed oxide support has a surface area of greater than about 10 m2/g at 1000° C. in air coated on the metal support; and, a catalytically active component coated on the mixed oxide support. 2. A monolithic catalytic combustion catalyst according to claim 1, wherein the mixed oxide support comprises zirconium. 3. A monolithic catalytic combustion catalyst according to claim 2, wherein the pentavalent cation is tantalum, and wherein tantalum comprises about 2 mole percent to about 70 mole percent of the mixed oxide. 4. A monolithic catalytic combustion catalyst according to claim 2, wherein the metal support is a corrugated foil. 5. A monolithic catalytic combustion catalyst according to claim 2, wherein the catalytically active component is palladium. 6. A monolithic catalytic combustion catalyst according to claim 5, wherein the mixed oxide support comprises a single phase solid solution. 7. A monolithic catalytic combustion catalyst according to claim 6, wherein the single phase solid solution is TaZr2.75 O8. 8. A monolithic catalytic combustion catalyst according to claim 7, wherein the metal support is a Fe/Cr/Al or Ni/Cr/Al metal foil, and wherein the single phase TaZr2.75 O8solid solution is a single phase material having the X-ray diffraction structure depicted in FIG. 8. 9. A monolithic catalytic combustion catalyst according to claim 1, wherein the pentavalent cation comprises tantalum. 10. A monolithic catalytic combustion catalyst according to claim 1, wherein the pentavalent cation comprises niobium. 11. A monolithic catalytic combustion catalyst according to claim 1, wherein the mixed oxide support is about 2 mole percent to about 70 mole percent tantalum. 12. A monolithic catalytic combustion catalyst according to claim 1, wherein the mixed oxide support is about 10 mole percent to about 50 mole percent tantalum. 13. A monolithic catalytic combustion catalyst according to claim 1, wherein the mixed oxide support is a solid solution. 14. A monolithic catalytic combustion catalyst according to claim 13, wherein the solid solution is substantially a single phase solid solution. 15. A monolithic catalytic combustion catalyst according to claim 14, wherein the single phase solid comprises TaZr2.75 O8. 16. A monolithic catalytic combustion catalyst according to claim 15, wherein the single phase TaZr2.75 O8solid solution is a single phase material having the X-ray diffraction structure depicted in FIG. 8.