Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 121: Solid-Liquid Interface IV: Structure and Spectroscopy
O 121.4: Talk
Friday, March 20, 2020, 11:30–11:45, TRE Phy
Spectroscopic Insights into Liquid Metal Solutions for Catalysis — •Haiko Wittkämper1, Mathias Grabau1, Sven Meisel2, Mingjian Wu3, Andreas Görling2, Erdmann Spiker3, Hans-Peter Steinrück1, and Christian Papp1 — 1Chair of Physical Chemistry 2, FAU Erlangen-Nürnberg — 2Chair of Theoretical Chemistry, FAU Erlangen-Nürnberg — 3Chair of Micro- and Nanostructure Research, FAU Erlangen-Nürnberg
Supported catalytically active liquid metal solutions (SCALMS) are deactivation resilient and highly active dehydrogenation catalysts, based on binary transition metal Gallium alloys. The remarkable properties of these catalysts, especially their good resiliency towards deactivation, are attested to the atomic dispersion of the active transition metal in liquid Gallium nano-droplets and the dynamics at the liquid metal/gas interface. The concept was pioneered at FAU and over the recent years we published findings on PdGa, PtGa and most recently RhGa alloys. Herein we present XPS studies on macroscopic alloy droplets and model catalyst particles, including in situ heating and comparative near ambient pressure oxidation studies for Pd-, Pt- and RhGa alloys. In all cases transition metal enrichment at the surface is observed, the development during the oxidation however suggests that despite their similarity the chemical origin of the enrichment effects differ for the transition metals.