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O: Fachverband Oberflächenphysik

O 71: Poster Wednesday: Adsorption and Catalysis

O 71.8: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Hydrogenation of ethylene on supported size-selected Pt-clusters — •Kevin Bertrang, Maximilian Krause, Marian Rötzer, Andrew Crampton, and Ueli Heiz — Chair of Physical Chemistry, Department of Chemistry & Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany

The interplay between catalyst and support, e.g. thin silica films on metal single crystals, has proven a key factor in the activity of such systems. The nature of their interaction determines the charge transfer to the supported catalyst and therefore its electronic proprieties. The catalyst's local electron density can be altered by varying the underlying metal, which allows to tune the reactivity of the catalyst by specifically (de)charging it. Additionally to the bonds formed at the metal-silica interface, the resulting local work function of the support was found to govern charging effects. A system exhibiting a high local work function yields cluster of positive partial charge, vice versa clusters are partially charged negative with a low local work function. In this context, the change in activity of size-selecteed Pt-clusters towards ethylene hydrogenation has been investigated under steady-state conditions supported on thin silica films on different metal single-crystals. The catalytic samples were characterized through TPD, IRRAS and electron spectroscopy.