Stabilized Iridium and Ruthenium Catalysts
OwnerXiaolin D. Yanginventor
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Abstract
Provided herein is a non-single phase perovskite-type bulk material comprising one or more of Ru and Ir. In one embodiment, the surface region of the material is enriched with one or more of Ru and Ir relative to the bulk material. Also provided are methods for preparing the non-single phase, surface enriched perovskite-type material, catalytic articles comprising the non-single phase, surface enriched perovskite-type material and methods for their preparation, and methods for treating exhaust emissions using the non-single phase, surface enriched perovskite-type material.
Claims28
A non-single phase perovskite-type bulk material comprising a surface region enriched with one or both Ru and Ir precious metal relative to the bulk material.
(canceled)
A non-single phase perovskite-type material comprising one or more of Ru and Ir, wherein the material exhibits substantially no evaporative loss of the one or more of Ru and Ir following a thermal aging at temperatures exceeding about 800° C. for at least about 4 hours.
A process for preparing a non-single phase, surface enriched perovskite-type bulk material comprising providing a precious metal-free perovskite precursor, impregnating the precursor with one or more of an Ir- and Ru-containing aqueous solution, and drying and calcining the impregnated precursor at time and temperature sufficient to produce the non-single phase perovskite-type material surface enriched with one or more of Ir and Ru.
Dependencies are inferred from the claim text.