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O: Fachverband Oberflächenphysik
O 121: Solid-Liquid Interface IV: Structure and Spectroscopy
O 121.11: Vortrag
Freitag, 20. März 2020, 13:15–13:30, TRE Phy
Temperature-dependent sticking coefficient measurements of hydrocarbons on ionic liquid surfaces using molecular beam techniques — •Leonhard Winter, Radha G. Bhuin, Matthias Lexow, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen
Ionic Liquids (ILs) are a class of compounds consisting only of cations and anions, which are usually liquid already below room temperature. Besides numerous other applications, IL thin films are the key components in the catalytic concepts Supported Ionic Liquid Phase (SILP) and Solid Catalyst with Ionic Liquid Layer (SCILL). These catalysts show improved behavior e.g. in hydrogenation and hydroformylation reactions. In these processes, the phase transfer of hydrocarbons through the ionic liquid/gas interface plays a crucial role.
We have built a new ultra-high vacuum apparatus dedicated for the investigations of ILs with molecular beam techniques. It was used to study the interaction of n-butane with alkylimidazolium ionic liquids with varying chain length ([CnC1Im][Tf2N]). Based on the temperature-dependent behavior of the initial sticking coefficient at low temperatures, measured by the direct method of King and Wells, we discuss the adsorption dynamics on the different surfaces and their correlation with the molecular structure of the ILs.
L.W., R.G.B, M.L. and H.P.S. thank the European Research Council (ERC) for financial support of this research in the context of an Advanced Investigator Grant to H.P.S (No. 693398-ILID).