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 |
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| container_title | Science (American Association for the Advancement of Science) |
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| creator | 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 |
| description | 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. |
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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. 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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.</description><subject>Active sites</subject><subject>Alkalies</subject><subject>Atoms</subject><subject>Bioengineering</subject><subject>Catalysts</subject><subject>Ions</subject><subject>Oxides</subject><subject>Oxygen</subject><subject>Ratios</subject><subject>Washing</subject><issn>0036-8075</issn><issn>1095-9203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid/><recordid>eNqFybsKwjAUANAgCtbHJwj5gcDVWG1HER-DoLQFx3Ktt5ia2pJEtP16HdydznA6zJtC6ItwBrLLPAC5EAEs_T4bWFsAfC-UHotW-o5aidjhRWnV0pWfnDju33FNmSLL1-hQNy3xQ_USCZU1GXRPQ_yMjozYoeXxTeWOR4SZU9XDjlgvR21p_HPIJttNst6LwrrKpLVRJZomnUMAcuqD_Pcfrlk8MA</recordid><startdate>20100924</startdate><enddate>20100924</enddate><creator>Zhai, Yanping</creator><creator>Pierre, Danny</creator><creator>Si, Rui</creator><creator>Deng, Weiling</creator><creator>Ferrin, Peter</creator><creator>Nilekar, Anand U.</creator><creator>Peng, Guowen</creator><creator>Herron, Jeffrey A.</creator><creator>Bell, David C.</creator><creator>Saltsburg, Howard</creator><creator>Mavrikakis, Manos</creator><creator>Flytzani-Stephanopoulos, Maria</creator><general>American Association for the Advancement of Science</general><scope/></search><sort><creationdate>20100924</creationdate><title>Alkali-Stabilized Pt-OHxSpecies Catalyze Low-Temperature Water-Gas Shift Reactions</title><author>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</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-jstor_primary_408031503</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Active sites</topic><topic>Alkalies</topic><topic>Atoms</topic><topic>Bioengineering</topic><topic>Catalysts</topic><topic>Ions</topic><topic>Oxides</topic><topic>Oxygen</topic><topic>Ratios</topic><topic>Washing</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhai, Yanping</creatorcontrib><creatorcontrib>Pierre, Danny</creatorcontrib><creatorcontrib>Si, Rui</creatorcontrib><creatorcontrib>Deng, Weiling</creatorcontrib><creatorcontrib>Ferrin, Peter</creatorcontrib><creatorcontrib>Nilekar, Anand U.</creatorcontrib><creatorcontrib>Peng, Guowen</creatorcontrib><creatorcontrib>Herron, Jeffrey A.</creatorcontrib><creatorcontrib>Bell, David C.</creatorcontrib><creatorcontrib>Saltsburg, Howard</creatorcontrib><creatorcontrib>Mavrikakis, Manos</creatorcontrib><creatorcontrib>Flytzani-Stephanopoulos, Maria</creatorcontrib><jtitle>Science (American Association for the Advancement of Science)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhai, Yanping</au><au>Pierre, Danny</au><au>Si, Rui</au><au>Deng, Weiling</au><au>Ferrin, Peter</au><au>Nilekar, Anand U.</au><au>Peng, Guowen</au><au>Herron, Jeffrey A.</au><au>Bell, David C.</au><au>Saltsburg, Howard</au><au>Mavrikakis, Manos</au><au>Flytzani-Stephanopoulos, Maria</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Alkali-Stabilized Pt-OHxSpecies Catalyze Low-Temperature Water-Gas Shift Reactions</atitle><jtitle>Science (American Association for the Advancement of Science)</jtitle><date>2010-09-24</date><risdate>2010</risdate><volume>329</volume><issue>5999</issue><spage>1633</spage><epage>1636</epage><pages>1633-1636</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><abstract>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.</abstract><pub>American Association for the Advancement of Science</pub></addata></record> |
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| source | JSTOR; Science Online科学在线 |
| subjects | Active sites Alkalies Atoms Bioengineering Catalysts Ions Oxides Oxygen Ratios Washing |
| title | Alkali-Stabilized Pt-OHxSpecies Catalyze Low-Temperature Water-Gas Shift Reactions |
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