Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.84: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Heterogeneously Catalysed Process for HCl Oxidation over Stabilised RuO2(110) — •Stefan Zweidinger1, Jan Philipp Hofmann1, Marcus Knapp1, Daniela Crihan1, Ari Paavo Seitsonen2, Kees-Jan Weststrate3, Edwin Lundgren3, Jesper Andersen3, Michael Schmid4, Peter Varga4, and Herbert Over1 — 1Physikalisch-Chemisches Institut, Justus-Liebig Universität Gießen, Heinrich-Buff-Ring 58, D-35392 Gießen — 2IMPMC, CNRS & Université Pierre et Marie Curie, 4 place Jussieu, case 115, F-75252 Paris — 3Dept. of Synchrotron Radiation Research, Lund University, Sölvegatan 14, S-22362 Lund — 4Institut für Allgemeine Physik, TU Wien, Wiedner Hauptstraße 8-10, A-1040 Wien
High-resolution core-level shift spectroscopy and temperature-programmed reaction experiments together with density functional theory calculations reveal that the oxidation of HCl with oxygen producing Cl2 and water proceeds on the chlorine-stabilised RuO2 (110) surface via a one-dimensional Langmuir-Hinshelwood mechanism [1]. The recombination of two adjacent chlorine atoms on the catalyst’s surface constitutes the rate-determining step in this novel Deacon-like process. The stability of RuO2(110) is related to the selective replacement of bridging O atoms at the catalyst surface by chlorine atoms [2], as evidenced by high-resolution core-level shift spectroscopy, scanning tunnelling microscopy and density functional theory simulations.
[1] Crihan, D. et al.; Angew. Chemie Int. Ed. 2008, 47, 2131-2134.
[2] Zweidinger, S. et al.; J. Phys. Chem. C 2008, 112, 9966-9969.