Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 45: Focus Session: Catalysis at Liquid Interfaces
O 45.4: Talk
Wednesday, September 7, 2022, 16:00–16:15, H4
Investigation of Pt-Ga SCALMS model particles using photoelectron spectroscopy — •Christoph Wichmann1, Haiko Wittkämper1, Micheal Moritz1, Tzung-En Hsieh2, Johannes Frisch2, Mingjian Wu3, Marcus Bär2, Erdmann Spiecker3, Hans-Peter Steinrück1, and Christian Papp1 — 1Universität Erlangen, Physikalische Chemie II, Germany — 2Helmholtz-Zentrum Berlin, Germany — 3Universität Erlangen, Lehrstuhl für Werkstoffwissenschaften, Germany
Supported catalytically active liquid metal solutions (SCALMS) recently gained much attention as highly active and stable catalysts for the dehydrogenation of alkanes. SCALMS are metal solutions composed of low amounts of catalytically active transition metals like Rh, Pd, or Pt, alloyed with low melting metals like Ga, which act as matrix. Their stability is attested to a notable resistance against deactivation by coking, which is the prevalent deactivation route for dehydrogenation catalysts. To obtain a fundamental understanding, we make these complex materials systems accessible for a surface science approach. To gain insight in the catalytic properties of such nano-solutions, we work with supported PtGa particle systems. Herein, supported PtGa particle systems with low Pt content were investigated. The influence of the deposition sequence, the effects of annealing, and exposure to oxygen on the alloying and morphology of the resulting particle were studied with XPS using different excitation energies to obtain a depth-profile of the first few layers of the liquid.
Funded by SFB 1452.