Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Metals and semiconductors: Epitaxy and growth

O 90.4: Vortrag

Freitag, 30. März 2012, 11:15–11:30, A 060

Taking (different) sides - Zn and Ga on different Pd-facets — •Werner Stadlmayr, Christoph Rameshan, Simon Penner, Bernhard Klötzer, and Norbert Memmel — Institute of Physical Chemistry, University of Innsbruck, Innsbruck, Austria

Pd/Zn- and Pd/Ga-catalysts have been proven to be interesting candidates for methanol-steam-reforming (CH₃OH + H₂O → CO₂ + 3H₂)[1]. Using thin films of Zn and Ga on Pd-substrates, we investigated them regarding their alloying, structure as well as catalytic behaviour. We comment on the trends in thermal stability and give a comprehensive overview of the structural findings so far. In particular we find that both the films and alloys derived from the (110)-facets are more stable than those derived from the (111)-facets. Furthermore, Zn-films have a stronger tendency for surface alloy formation than Ga-films, while such a simple relationship does not hold for the decomposition of the alloys. Concerning catalytical properties, we show that properly prepared Pd/Zn-alloys exhibt CO₂-selectivity, while no such selectivity can be found for Pd/Ga-alloys.

[1] N. Iwasa and N. Takezawa, Top. Catal. 22, 3-4 (2003)