In his thesis, Florian Schweinberger investigates the influence of
the precise size of catalytically active species on reactivity. In
order to do this he carries out studies both in UHV and under
ambient conditions for supported, size-selected Platium clusters
(8-68 atoms). Schweinberger probed the electronic structure,
adsorption properties and reactivity of two olefins on surfaces and
Pt clusters in the submonolayer range. With adsorbed
trichloroethene (TCE) a possible cluster-adsorbate induced change
in the electronic structure, and for ethene a low-temperature,
size-dependent self-/hydrogenation was observed.In a collaborative
approach, Schweinberger and colleagues investigated Pt clusters
under ambient pressure conditions. They characterised the clusters
at at the local and integral level and tested for temperature
stability. Experiments in gas phase ?-reactors and in liquid, as
part of a hybrid photocatalytic system, revealed size-dependent
reactivity.Overall this thesis is not only of interest for those
who want to perform similar experiments but also provides superb
scientific insights for researchers in the field.
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