Surface Investigation of Intermetallic PdGa(1̅ 1̅ 1̅)
The intermetallic PdGa is a highly selective and potent catalyst in the semihydrogenation of acetylene, which is attributed to the surface stability and isolated Pd atom ensembles. In this context PdGa single crystals of form B with (1̅ 1̅ 1̅) orientation were investigated by means of X-ray photoele...
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| Veröffentlicht in: | Langmuir 2012-05, Vol.28 (17), p.6848-6856 |
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| creator | Rosenthal, Dirk Widmer, Roland Wagner, Ronald Gille, Peter Armbrüster, Marc Grin, Yuri Schlögl, Robert Gröning, Oliver |
| description | The intermetallic PdGa is a highly selective and potent catalyst in the semihydrogenation of acetylene, which is attributed to the surface stability and isolated Pd atom ensembles. In this context PdGa single crystals of form B with (1̅ 1̅ 1̅) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(1̅ 1̅ 1̅) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(1̅ 1̅ 1̅) to be a bulk-truncated intermetallic compound with Pd–Ga partial covalent bonding. |
| doi_str_mv | 10.1021/la2050509 |
| format | Article |
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In this context PdGa single crystals of form B with (1̅ 1̅ 1̅) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(1̅ 1̅ 1̅) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(1̅ 1̅ 1̅) to be a bulk-truncated intermetallic compound with Pd–Ga partial covalent bonding.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la2050509</identifier><identifier>PMID: 22519655</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Catalysis ; Chemistry ; Exact sciences and technology ; General and physical chemistry ; Surface physical chemistry ; Theory of reactions, general kinetics. Catalysis. 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In this context PdGa single crystals of form B with (1̅ 1̅ 1̅) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(1̅ 1̅ 1̅) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(1̅ 1̅ 1̅) to be a bulk-truncated intermetallic compound with Pd–Ga partial covalent bonding.</description><subject>Catalysis</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Surface physical chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. 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Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rosenthal, Dirk</creatorcontrib><creatorcontrib>Widmer, Roland</creatorcontrib><creatorcontrib>Wagner, Ronald</creatorcontrib><creatorcontrib>Gille, Peter</creatorcontrib><creatorcontrib>Armbrüster, Marc</creatorcontrib><creatorcontrib>Grin, Yuri</creatorcontrib><creatorcontrib>Schlögl, Robert</creatorcontrib><creatorcontrib>Gröning, Oliver</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rosenthal, Dirk</au><au>Widmer, Roland</au><au>Wagner, Ronald</au><au>Gille, Peter</au><au>Armbrüster, Marc</au><au>Grin, Yuri</au><au>Schlögl, Robert</au><au>Gröning, Oliver</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Surface Investigation of Intermetallic PdGa(1̅ 1̅ 1̅)</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2012-05-01</date><risdate>2012</risdate><volume>28</volume><issue>17</issue><spage>6848</spage><epage>6856</epage><pages>6848-6856</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>The intermetallic PdGa is a highly selective and potent catalyst in the semihydrogenation of acetylene, which is attributed to the surface stability and isolated Pd atom ensembles. In this context PdGa single crystals of form B with (1̅ 1̅ 1̅) orientation were investigated by means of X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), scanning tunneling microscopy (STM), X-ray photoelectron diffraction (XPD), and low-energy electron diffraction (LEED) to study the electronic and geometric properties of this surface. UPS and thermal desorption spectroscopy (TDS) were used to probe the chemisorption behavior of CO. The PdGa(1̅ 1̅ 1̅) surface exhibits a (1 × 1) LEED and a pronounced XPD pattern indicating an unreconstructed bulk-truncated surface. Low-temperature STM reveals a smooth surface with a (1 × 1) unit cell. No segregation occurs, and no impurities are detected by XPS. The electronic structure and the CO adsorption properties reveal PdGa(1̅ 1̅ 1̅) to be a bulk-truncated intermetallic compound with Pd–Ga partial covalent bonding.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>22519655</pmid><doi>10.1021/la2050509</doi><tpages>9</tpages></addata></record> |
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| subjects | Catalysis Chemistry Exact sciences and technology General and physical chemistry Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
| title | Surface Investigation of Intermetallic PdGa(1̅ 1̅ 1̅) |
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