Alkali-Stabilized Pt-OHxSpecies Catalyze Low-Temperature Water-Gas Shift Reactions

We report that alkali ions (sodium or potassium) added in small amounts activate platinum adsorbed on alumina or silica for the low-temperature water-gas shift (WGS) reaction (H₂O + CO → H₂ + CO₂) used for producing H₂. The alkali ion-associated surface OH groups are activated by CO at low temperatu...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2010-09, Vol.329 (5999), p.1633-1636
Hauptverfasser: Zhai, Yanping, Pierre, Danny, Si, Rui, Deng, Weiling, Ferrin, Peter, Nilekar, Anand U., Peng, Guowen, Herron, Jeffrey A., Bell, David C., Saltsburg, Howard, Mavrikakis, Manos, Flytzani-Stephanopoulos, Maria
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Sprache:eng
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Zusammenfassung:We report that alkali ions (sodium or potassium) added in small amounts activate platinum adsorbed on alumina or silica for the low-temperature water-gas shift (WGS) reaction (H₂O + CO → H₂ + CO₂) used for producing H₂. The alkali ion-associated surface OH groups are activated by CO at low temperatures (~ 100° C) in the presence of atómically dispersed platinum. Both experimental evidence and density functional theory calculations suggest that a partially oxidized Pt-alkali-O x (OH) y species is the active site for the low-temperature Pt-catalyzed WGS reaction. These findings are useful for the design of highly active and stable WGS catalysts that contain only trace amounts of a precious metal without the need for a reducible oxide support such as ceria.
ISSN:0036-8075
1095-9203