Preparation of multi-component Ce, Zr, Mox high oxygen-ion-conduct/oxygen-storage-capacity materials
AssigneeDelphi Technologies, Inc.
InventorsBortun I. Anatoly, John Gerard Nunan
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Abstract
The present invention relates to high oxygen ion conducting/oxygen storage capacity (OIC/OS) materials, a catalyst employing the OIC/OS materials, and a method for converting nitrogen oxides using the catalyst. The OIC/OS materials have stable cubic crystalline structures under oxidizing conditions (in air) up to about 1200° C. and in reducing conditions (5% hydrogen) up to about 1000° C. for 24 hours. These materials comprise up to about 95 mole percent (mole %) zirconium, up to about 50 mole % cerium and up to about 10 mole % yttrium, and optionally up to about 15 mole % of Y plus another rare earth or alkaline earth metal.
Claims23
A method of converting nitrogen oxides to nitrogen comprising:
- contacting an oxide of nitrogen to a catalyst comprising:
- a zirconium-rich CeO2/ZrO2/MxOy solid solution OIC/OS material comprising a cubic crystal structure, wherein MxOy is Y2O3, and wherein the zirconium, cerium, and yttrium are present at levels of up to about 95, up to about 40, and up to about 10 mole percent, respectively;
- a noble metal catalyst;
- and
- a porous support
- wherein said OIC/OS material, said noble metal catalyst and said porous support are disposed on a substrate.
A catalyst comprising:
- a zirconium-rich CeO2/ZrO2/MxOy solid solution OIC/OS material comprising a cubic crystal structure, wherein MxOy is Y2O3, and wherein the zirconium, cerium, and yttrium are present at levels of:
- up to about 95, up to about 40, and up to about 10 mole percent, respectively;
- a noble metal catalyst;
- and
- a porous support,
- wherein said OIC/OS material, said noble metal catalyst and said porous support are disposed on a substrate.
A zirconium-rich CeO2/ZrO2/MxOy solid solution OIC/OS material comprising a cubic crystal structure, wherein MxOy is Y2O3, and wherein the zirconium, cerium, and yttrium are present at levels of up to about 95, up to about 40, and up to about 10 mole percent, respectively.
Dependencies are inferred from the claim text.