Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 16: Nanoscale Heterogeneous Catalysis
O 16.2: Vortrag
Montag, 16. März 2020, 15:15–15:30, TRE Ma
Hydrogenation of small organic molecules on size-selected Pd-clusters supported on MgO — •Kevin Bertrang, Maximilian Krause, Marian David Rötzer, Andrew Scott Crampton, and Ueli Heiz — Technische Universität München, Lichtenbergstr. 4, D-85748 Garching, Germany
Heterogeneous catalysis on size-selected clusters supported on metal-oxide films opens up a huge pallet of potential catalysts. The unique, non-scalable particle size dependency down to differences of only one atom lead to unique chemical and physical proprieties reflected by drastic changes in chemical activity and selectivity. Cluster-size portrays only one of a manifold of tunable variables. Properties of the support (i.e. metal-oxide thin films grown on metal single crystals) influence the cluster charge: film thickness, acidity and reducibility, (local) crystal work function, interface interactions. Control of these quantities allows to induce drastic changes in a catalyst’s performance. Beside activity the selectivity of a catalyzed reaction is a fundamental concept in heterogeneous catalysis. Great emphasis is put on tailoring catalytic systems to stir their selectivity towards chemically desirable products. In this regard we studied the ripening of size-selected supported Pdn-clusters (n ≤ 30) and the adsorption properties of acrolein, crotonaldeyhde and prenal on MgO by means of electronic (UPS, MIES) and vibrational (IRRAS) spectroscopy. Further, the activity and selectivity towards the hydrogenation of small organic molecules is investigated by means of pulsed molecular beam reactive scattering and temperature programmed desorption.