A catalyst for preferentially reducing carbon monoxide in a hydrogen stream. The catalyst is formed from a chemical composition including a hexaaluminate, a metal hydroxide and a precious metal. The composition may be disposed on a support or may be extruded or cast into or onto a support. Incorpora
A catalyst for preferentially reducing carbon monoxide in a hydrogen stream. The catalyst is formed from a chemical composition including a hexaaluminate, a metal hydroxide and a precious metal. The composition may be disposed on a support or may be extruded or cast into or onto a support. Incorporation of hexaaluminates allows inclusion of metal hydroxides that flux the active precious metal surface at higher temperatures than can aluminum oxide-based catalytic compositions, thereby enhancing resistance of the catalyst and monolithic support and increasing the durability and thermal range of the PROX catalyst. An additional advantage is that lesser amounts of precious metal oxides need be deposited onto the hexaaluminate, while retaining activity similar to aluminum oxide compositions.
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What is claimed is: 1. A catalytic composition for selectively removing carbon monoxide from a hydrogen fuel cell feed stream, the catalytic composition consisting essentially of: a) a hexaaluminate containing a cation selected from the group consisting of iron, barium, strontium, cerium, hafnium,
What is claimed is: 1. A catalytic composition for selectively removing carbon monoxide from a hydrogen fuel cell feed stream, the catalytic composition consisting essentially of: a) a hexaaluminate containing a cation selected from the group consisting of iron, barium, strontium, cerium, hafnium, scandium, zirconium, yttrium, praseodymium, neodymium, magnesium, lanthanum, barium-lanthanum, strontium-lanthanum, and combinations thereof; b) an alkali and/or alkaline earth metal hydroxide; and c) a precious metal, wherein the catalytic composition containing an alkali and/or alkaline earth metal ion selectively oxidizes carbon monoxide to carbon dioxide to remove the carbon monoxide from the hydrogen fuel cell feed stream. 2. A catalytic composition in accordance with claim 1 wherein said alkali and/or alkaline earth metal hydroxide is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, strontium hydroxide, barium hydroxide, and combinations thereof. 3. A catalytic composition in accordance with claim 2 wherein said alkali and/or alkaline earth metal hydroxide is potassium hydroxide. 4. A catalytic composition in accordance with claim 1 wherein said precious metal is selected from the group consisting of iridium, ruthenium, platinum, and combinations thereof. 5. A catalyst for selectively removing carbon monoxide from a hydrogen fuel cell feed stream, the catalyst being formed by coating onto a substrate a catalytic composition consisting essentially of: a) a hexaaluminate containing a cation selected from the group consisting of iron, barium, strontium, cerium, hafnium, scandium, zirconium, yttrium, praseodymium, neodymium, magnesium, lanthanum, barium-lanthanum, strontium-lanthanum, and combinations thereof; b) an alkali and/or alkaline earth metal hydroxide; and c) a precious metal, wherein the catalytic composition containing an alkali and/or alkaline earth metal ion selectively oxidizes carbon monoxide to carbon dioxide to remove the carbon monoxide from the hydrogen fuel cell feed stream. 6. A catalyst in accordance with claim 5 wherein said alkali and/or alkaline earth metal hydroxide is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, strontium hydroxide, barium hydroxide, and combinations thereof. 7. A catalyst in accordance with claim 6 wherein said alkali and/or alkaline earth metal hydroxide is potassium hydroxide. 8. A catalyst in accordance with claim 5 wherein said precious metal is selected from the group consisting of iridium, ruthenium, platinum, and combinations thereof. 9. A fuel cell system including a catalytic composition for selectively removing carbon monoxide from a hydrogen fuel cell feedstream, the catalytic composition consisting essentially of: a) a hexaaluminate containing a cation selected from the group consisting of iron, barium, strontium, cerium, hafnium, scandium, zirconium, yttrium, praseodymium, neodymium, magnesium, lanthanum, barium-lanthanum, strontium-lanthanum, and combinations thereof; b) an alkali and/or alkaline earth metal hydroxide; and c) a precious metal, wherein the catalytic composition containing an alkali and/or alkaline earth metal ion selectively oxidizes carbon monoxide to carbon dioxide to remove the carbon monoxide from the hydrogen fuel cell feed stream. 10. A catalytic composition in accordance with claim 9 said alkali and/or alkaline earth metal hydroxide is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, strontium hydroxide, barium hydroxide, and combinations thereof. 11. A fuel cell system in accordance with claim 10 wherein said alkali and/or alkaline earth metal hydroxide is potassium hydroxide. 12. A fuel cell system in accordance with claim 9 wherein said precious metal is selected from the group consisting of iridium, ruthenium, platinum, and combinations thereof.
Dieter Lindner DE; Renee Van Yperen DE; Lothar Mussmann DE; Egbert Lox DE; Thomas Kreuzer DE, Exhaust gas treatment catalyst for internal combustion engines with two catalytically active layers on a carrier structure.
Dalla Betta Ralph A. (Mountain View CA) Tsurumi Kazunori (Fujisawa JPX) Ezawa Nobuyasu (Koto JPX), Multistage process for combusting fuel mixtures using oxide catalysts in the hot stage.
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