Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Fundamentals of Catalysis II
O 82.5: Vortrag
Donnerstag, 4. April 2019, 16:00–16:15, H5
Supported catalytically active liquid metal solutions: Preparation and characterization of Pd-Ga and Pt-Ga model systems on modified HOPG — •Miroslav Kettner1, Sven Maisel2, Corinna Stumm1, Matthias Schwarz1, Christian Schuschke1, Andreas Görling2, and Jörg Libuda1 — 1Physikalische Chemie II, FAU Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany — 2Lehrstuhl für Theoretische Chemie, FAU Erlangen-Nürnberg, Egerlandstr. 3, D-91058 Erlangen, Germany
Single atom catalysts merge attractive properties of homogeneous and heterogeneous catalysts, such as atomically defined active sites, high selectivity, and high metal utilization. Recently, the concept of supported catalytically active liquid metal solutions (SCALMS) proved effective in creating such isolated active sites by diluting an active metal in a low melting point metallic matrix. To explore the properties of such systems under surface science conditions, we have prepared model systems for Pd-Ga and Pt-Ga SCALMS by physical vapor deposition of Pd/Pt and Ga in ultrahigh vacuum onto highly oriented pyrolytic graphite (HOPG) pre-modified by Ar+ bombardment. We investigated the growth behavior, the morphology, the surface chemistry, and the stability of Pd-Ga and Pt-Ga alloys on HOPG by combining AFM and IRAS experiments with DFT calculations. The results prove the single atom character of the active sites in Ga-rich alloys. Thus, the Ga-rich nanoalloy systems prepared on modified HOPG present a well-suited model to study the adsorption and reaction on SCALMS by surface science methods.