title: The silver-oxygen system in catalysis: new insights by near ambient pressure X-ray photoelectron spectroscopy.
abstract: We addressed the interaction of oxygen with silver by synchrotron based near ambient pressure X-ray photoelectron spectroscopy at temperatures relevant for industrial oxidation reactions performed with silver catalysts. For silver single crystals, polycrystalline foils and powders in equilibrium with gas phase O(2), we observed the dynamics of the formation of five different atomic oxygen species with relative abundances depending on the temperature and time. Correlation of their formation kinetics with spectroscopic features and thermal stability indicates that these are distinct species with different electronic structures, which might relate to the different roles of silver in oxidation reactions.
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Department of Inorganic Chemistry, Berlin, Germany. tulio@fhi-berlin.mpg.de
authors.forename: Tulio C R
authors.initials: TC
authors.lastname: Rocha
authors.forename: Andreas
authors.initials: A
authors.lastname: Oestereich
authors.forename: Demid V
authors.initials: DV
authors.lastname: Demidov
authors.forename: Michael
authors.initials: M
authors.lastname: Hävecker
authors.forename: Spiros
authors.initials: S
authors.lastname: Zafeiratos
authors.forename: Gisela
authors.initials: G
authors.lastname: Weinberg
authors.forename: Valerii I
authors.initials: VI
authors.lastname: Bukhtiyarov
authors.forename: Axel
authors.initials: A
authors.lastname: Knop-Gericke
authors.forename: Robert
authors.initials: R
authors.lastname: Schlögl
mesh_terms: D002384:Catalysis; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D011312:Pressure; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D012834:Silver; D010100:Oxygen