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O: Fachverband Oberflächenphysik

O 56: Oxide Surfaces I

O 56.8: Vortrag

Mittwoch, 13. März 2013, 17:45–18:00, H45

CO Induced Adatom Sintering in a Model Catalyst: Pd/Fe3O4 — •Zbynek Novotny¹, Gareth S. Parkinson¹, Giacomo Argentero¹, Michael Schmid¹, Jiri Pavelec¹, Rukan Kosak², Peter Blaha², and Ulrike Diebold¹ — ¹Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10/134, 1040 Vienna, Austria — ²Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165-TC, 1060 Vienna

The coarsening of catalytically-active metal clusters is often accelerated by the presence of gases through the formation of mobile intermediates. We use scanning tunneling microscopy (STM) to follow the CO induced coalescence of Pd adatoms supported on the Fe3O4(001) surface at room temperature. Pd-carbonyl species, formed via the so-called 'skyhook' effect, are responsible for Pd mobility in the system. Using time-lapse STM, key steps of cluster nucleation and growth are observed in an atom-by-atom fashion.

This material is based upon work supported as part of the Centre for Atomic-Level Catalyst Design, an Energy Frontier Research Centre funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number #DE-SC0001058.