caa a22 4500 46788871X CHVBK 20180406152742.0 cr unu---uuuuu 170328e20060401xx s 000 0 eng 10.1007/s11144-006-0050-2 doi (NATIONALLICENCE)springer-10.1007/s11144-006-0050-2 Hydrogen-induced metal-oxide interaction studied on noble metal model catalysts [Elektronische Daten] [Werner Unterberger, Bernd Jenewein, Bernhard Klötzer, Simon Penner, Wolfgang Reichl, Günther Rupprechter, Di Wang, Di Wang, Robert Schlögl, Konrad Hayek] Summary: The effect of hydrogen reduction on the structure and catalytic properties of "thin film”and "inverse”model systems for supported metal catalysts is discussed. Thin film model catalysts were obtained by epitaxial growth of Pt and Rh nanoparticles on NaCl(001), which were coated with amorphous or crystalline supports of alumina, silica, titania, ceria and vanadia. Structural and morphological changes upon hydrogen reduction between 473 and 973 K were examined by high resolution electron microscopy. Metal-oxide interaction sets in at a specific reduction temperature and is characterized by an initial "wetting”stage, followed by alloy formation at increasing temperature, in the order VOx< TiOx< SiO2< CeOx< Al2O3."Inverse”model systems were prepared by deposition of oxides on a metal substrate, e.g. VOx/Rh and VOx/Pd. Reduction of inverse systems at elevated temperature induces subsurface alloy formation. In contrast to common bimetallic surfaces, the stable subsurface alloys of V/Rh and V/Pd have a purely noble metal-terminated surface, with V positioned in near-surface layers. The uniform composition of the metallic surface layer excludes catalytic ensemble effects in favor of ligand effects. Activity and selectivity, e.g. for CO and CO2methanation and for partial oxidation of ethene, are mainly controlled by the temperature of annealing or reduction.Reduction above 573 K turned out to be beneficial for the catalytic activity of the subsurface alloys, but not for the corresponding thin film systems which tend to deactivate viaparticle encapsulation.</o:p> Springer-Verlag/Akadémiai Kiadó, 2006 rhodium nationallicence platinum nationallicence CO hydrogenation nationallicence alumina nationallicence palladium nationallicence ceria nationallicence ethene oxidation nationallicence alloy formation nationallicence inverse model catalyts nationallicence thin film catalyst nationallicence vanadia nationallicence Unterberger Werner Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut Jenewein Bernd Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut Klötzer Bernhard Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut Penner Simon Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut Reichl Wolfgang Institut für Physikalische Chemie, Leopold-Franzens-Universität Present address: E+E Elektronik GmbH,, Innrain 52A, A-6020 Innsbruck, Austria A-4209 Engerwitzdorf, Austria aut Rupprechter Günther Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany aut Wang Di Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany aut Schlögl Robert Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin, Germany aut Hayek Konrad Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut Reaction Kinetics and Catalysis Letters Kluwer Academic Publishers 87/2(2006-04-01), 215-234 0133-1736 87:2<215 2006 87 11144 https://doi.org/10.1007/s11144-006-0050-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-006-0050-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Unterberger Werner Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut NATIONALLICENCE 700 1- Jenewein Bernd Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut NATIONALLICENCE 700 1- Klötzer Bernhard Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut NATIONALLICENCE 700 1- Penner Simon Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut NATIONALLICENCE 700 1- Reichl Wolfgang Institut für Physikalische Chemie, Leopold-Franzens-Universität Present address: E+E Elektronik GmbH,, Innrain 52A, A-6020 Innsbruck, Austria A-4209 Engerwitzdorf, Austria aut NATIONALLICENCE 700 1- Rupprechter Günther Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany aut NATIONALLICENCE 700 1- Wang Di Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany aut NATIONALLICENCE 700 1- Schlögl Robert Department of Inorganic Chemistry, Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin, Germany aut NATIONALLICENCE 700 1- Hayek Konrad Institut für Physikalische Chemie, Leopold-Franzens-Universität, Innrain 52A, A-6020 Innsbruck, Austria aut NATIONALLICENCE 773 0- Reaction Kinetics and Catalysis Letters Kluwer Academic Publishers 87/2(2006-04-01), 215-234 0133-1736 87:2<215 2006 87 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer