Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Focus Session: Catalysis at Liquid Interfaces

O 45.9: Vortrag

Mittwoch, 7. September 2022, 17:45–18:00, H4

SCILL model catalysis - butadiene hydrogenation studied with molecular beam techniques — •Leonhard Winter, Stephen Massicot, Afra Gezmis, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen

Ionic Liquids (ILs) are low temperature melting salts, often liquid even below room temperature. In “Solid Catalyst with Ionic Liquid Layer (SCILL)” systems, IL thin films are used to coat the catalytically active metal and therefore, modify the reactivity and the selectivity of the catalyst. Selectivity is crucial e.g., in the industrially important hydrogenation of 1,3-butadiene to butenes since further hydrogenation to n-butane must be suppressed.

We used a supersonic molecular beam to investigate the dynamical details of this reaction in a UHV model study. The method of King and Wells was used to measure sticking coefficients of 1,3-butadiene and 1-butene on bare Pt(111) and Pt(111) coated with ultrathin layers of the IL 1,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C1C1Im][Tf2N]). The hydrogenation reaction was also modelled by pre-adsorbing and co-feeding hydrogen gas.

Supported by the DFG through the Collaborative Research Center (CRC)/ Sonderforschungsbereich (SFB) 1452.