Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Fundamentals of Catalysis II

O 82.4: Vortrag

Donnerstag, 4. April 2019, 15:45–16:00, H5

Spectroscopic Insights to Liquid Rh-Ga Alloys for Effective Propane Dehydrogenation — •Haiko Wittkämper, Narayanan Raman, Mathias Grabau, Sven Maisel, Nicola Taccardi, Jonas Debuschewitz, Tanja Bauer, Mingjian Wu, Marco Haumann, Andreas Görling, Erdmann Spiecker, Jörg Libuda, Peter Wasserscheid, Hans-Peter Steinrück, and Christian Papp — Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)

We present a study of Rhodium as active metal for selective alkane dehydrogenation. It becomes a very active, selective and stable propane dehydrogenation catalyst when incorporated in a matrix of liquid gallium on oxidic support particles. The remarkable properties of this catalyst are attested to the atomic dispersion of the active transition metal in liquid gallium nano-droplets, which is indicated by temperature dependent HRTEM. The observed temperature-dependence of the selectivity of the catalyst is due to the dissolution/precipitation of Rh-rich intermetallic phases, leading to the Rh enrichment/depletion of the liquid Ga phase as is demonstrated by temperature dependent XPS studies of Rh-Ga alloy model systems. Based on ab initio molecular dynamics simulations and density functional calculations of a possible reaction site a mechanism for the system is proposed that goes in line with what we previously proposed for similar supported catalytically active liquid metal solutions such as Pt-Ga and Pd-Ga.