Metallic Nature and Surface Diffusion of CO Adsorbed on Ru Nanoparticles in Aqueous Media: A 13C NMR Study
We report the first observation of the 13C nuclear magnetic resonance spectroscopy (NMR) of 13CO, adsorbed from 13CO saturated 0.5 M sulfuric acid solutions, onto the surfaces of commercial Ru-black nanoparticles. The 13C NMR spectra consist of a symmetrically broadened peak having a large isotropic...
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| Veröffentlicht in: | The journal of physical chemistry. B 2005-02, Vol.109 (7), p.2474-2477 |
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| container_end_page | 2477 |
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| container_issue | 7 |
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| container_title | The journal of physical chemistry. B |
| container_volume | 109 |
| creator | Babu, Panakkattu K Chung, Jong Ho Kuk, Seung Taek Kobayashi, Takeshi Oldfield, Eric Wieckowski, Andrzej |
| description | We report the first observation of the 13C nuclear magnetic resonance spectroscopy (NMR) of 13CO, adsorbed from 13CO saturated 0.5 M sulfuric acid solutions, onto the surfaces of commercial Ru-black nanoparticles. The 13C NMR spectra consist of a symmetrically broadened peak having a large isotropic shift as compared to CO adsorbed onto supported Ru catalysts. The variation of the spin−lattice relaxation rate follows Korringa behavior, indicating the metallic nature of adsorbed CO, in addition to varying across the spectrum in a Korringa-like manner. Motional narrowing of the NMR spectrum at higher temperatures, together with an additional contribution to the spin−lattice relaxation rate, indicate that adsorbed CO undergoes rapid diffusion on the particle surfaces. A two-band model analysis of the NMR results indicates that the CO adsorption bond is weaker on Ru as compared to either Pt or Pd. This is also supported by a reduction in the activation energy for CO diffusion on Ru vs either Pt or Pd nanoparticles. |
| doi_str_mv | 10.1021/jp040729k |
| format | Article |
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The 13C NMR spectra consist of a symmetrically broadened peak having a large isotropic shift as compared to CO adsorbed onto supported Ru catalysts. The variation of the spin−lattice relaxation rate follows Korringa behavior, indicating the metallic nature of adsorbed CO, in addition to varying across the spectrum in a Korringa-like manner. Motional narrowing of the NMR spectrum at higher temperatures, together with an additional contribution to the spin−lattice relaxation rate, indicate that adsorbed CO undergoes rapid diffusion on the particle surfaces. A two-band model analysis of the NMR results indicates that the CO adsorption bond is weaker on Ru as compared to either Pt or Pd. 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This is also supported by a reduction in the activation energy for CO diffusion on Ru vs either Pt or Pd nanoparticles.</description><subject>Adsorption</subject><subject>Carbon Isotopes - chemistry</subject><subject>Catalysis</subject><subject>Magnetic Resonance Spectroscopy - methods</subject><subject>Metal Nanoparticles - chemistry</subject><subject>Metals - chemistry</subject><subject>Microscopy, Electron, Transmission</subject><subject>Models, Chemical</subject><subject>Palladium - chemistry</subject><subject>Platinum - chemistry</subject><subject>Rubidium - chemistry</subject><subject>Temperature</subject><subject>Water - chemistry</subject><issn>1520-6106</issn><issn>1520-5207</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNo9kUtPwzAMxyMEYjA48AVQLnAr5NEkLbepPMUeiA3ELUrTVMrWtSNpJHbjytfkk1C0wcGyZf9s_W0DcILRBUYEX85XKEaCpIsdcIAZQVFnYncbc4x4Dxx6P0eIMJLwfdDDPGGYxPEBWI5Mq6rKajhWbXAGqrqA0-BKpQ28tmUZvG1q2JQwm8BB4RuXmwJ2mefQddTNSrnW6sp4aGs4eA-mCR6OTGHV1ffnFxxATDM4Hj3DaRuK9RHYK1XlzfHW98HL7c0su4-Gk7uHbDCMFCYkjmhMTY6E4EZoTVKac6pTzPK00EikcVlgTnKCTEKoMjwRSSlYigXjcWkQQ5r2wflm7so1nSbfyqX12lSVqn8FSoEwTxPGO_B0C4Z8aQq5cnap3Fr-HagDog1gfWs-_uvKLSQXVDA5e5rK18e30eyNziTt-LMNr7SX8ya4uttTYiR_HyX_H0V_ADmugCA</recordid><startdate>20050224</startdate><enddate>20050224</enddate><creator>Babu, Panakkattu K</creator><creator>Chung, Jong Ho</creator><creator>Kuk, Seung Taek</creator><creator>Kobayashi, Takeshi</creator><creator>Oldfield, Eric</creator><creator>Wieckowski, Andrzej</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>7X8</scope></search><sort><creationdate>20050224</creationdate><title>Metallic Nature and Surface Diffusion of CO Adsorbed on Ru Nanoparticles in Aqueous Media: A 13C NMR Study</title><author>Babu, Panakkattu K ; Chung, Jong Ho ; Kuk, Seung Taek ; Kobayashi, Takeshi ; Oldfield, Eric ; Wieckowski, Andrzej</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a1224-343eb0776e7cc293b63c915b9dc0794fd162b20e823ae6878f75917564fe050c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Adsorption</topic><topic>Carbon Isotopes - chemistry</topic><topic>Catalysis</topic><topic>Magnetic Resonance Spectroscopy - methods</topic><topic>Metal Nanoparticles - chemistry</topic><topic>Metals - chemistry</topic><topic>Microscopy, Electron, Transmission</topic><topic>Models, Chemical</topic><topic>Palladium - chemistry</topic><topic>Platinum - chemistry</topic><topic>Rubidium - chemistry</topic><topic>Temperature</topic><topic>Water - chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Babu, Panakkattu K</creatorcontrib><creatorcontrib>Chung, Jong Ho</creatorcontrib><creatorcontrib>Kuk, Seung Taek</creatorcontrib><creatorcontrib>Kobayashi, Takeshi</creatorcontrib><creatorcontrib>Oldfield, Eric</creatorcontrib><creatorcontrib>Wieckowski, Andrzej</creatorcontrib><collection>Istex</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>MEDLINE - Academic</collection><jtitle>The journal of physical chemistry. B</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Babu, Panakkattu K</au><au>Chung, Jong Ho</au><au>Kuk, Seung Taek</au><au>Kobayashi, Takeshi</au><au>Oldfield, Eric</au><au>Wieckowski, Andrzej</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Metallic Nature and Surface Diffusion of CO Adsorbed on Ru Nanoparticles in Aqueous Media: A 13C NMR Study</atitle><jtitle>The journal of physical chemistry. B</jtitle><addtitle>J. Phys. Chem. B</addtitle><date>2005-02-24</date><risdate>2005</risdate><volume>109</volume><issue>7</issue><spage>2474</spage><epage>2477</epage><pages>2474-2477</pages><issn>1520-6106</issn><eissn>1520-5207</eissn><abstract>We report the first observation of the 13C nuclear magnetic resonance spectroscopy (NMR) of 13CO, adsorbed from 13CO saturated 0.5 M sulfuric acid solutions, onto the surfaces of commercial Ru-black nanoparticles. The 13C NMR spectra consist of a symmetrically broadened peak having a large isotropic shift as compared to CO adsorbed onto supported Ru catalysts. The variation of the spin−lattice relaxation rate follows Korringa behavior, indicating the metallic nature of adsorbed CO, in addition to varying across the spectrum in a Korringa-like manner. Motional narrowing of the NMR spectrum at higher temperatures, together with an additional contribution to the spin−lattice relaxation rate, indicate that adsorbed CO undergoes rapid diffusion on the particle surfaces. A two-band model analysis of the NMR results indicates that the CO adsorption bond is weaker on Ru as compared to either Pt or Pd. This is also supported by a reduction in the activation energy for CO diffusion on Ru vs either Pt or Pd nanoparticles.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>16851244</pmid><doi>10.1021/jp040729k</doi><tpages>4</tpages></addata></record> |
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| subjects | Adsorption Carbon Isotopes - chemistry Catalysis Magnetic Resonance Spectroscopy - methods Metal Nanoparticles - chemistry Metals - chemistry Microscopy, Electron, Transmission Models, Chemical Palladium - chemistry Platinum - chemistry Rubidium - chemistry Temperature Water - chemistry |
| title | Metallic Nature and Surface Diffusion of CO Adsorbed on Ru Nanoparticles in Aqueous Media: A 13C NMR Study |
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