Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 4: Metal & Semiconductor substrates: Adsorption and reaction of small molecules I
O 4.2: Vortrag
Montag, 9. März 2026, 10:45–11:00, HSZ/0401
Interfacial Processes in Ionic Liquid-Modified Catalysts — •Laura Ulm, Cynthia C. Fernández, Hans-Peter Steinrück, and Florian Maier — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg
Solid catalysts with ionic liquid layers (SCILL) provide a powerful route to tailor the selectivity of catalytic reactions. In this context, we study the elementary reaction steps involved in the hydrogenation of 1,3-butadiene to 1-butene, a reaction in which high selectivity is crucial for hydrocarbon processing. We recently demonstrated that ionic liquids (ILs) selectively modify the adsorption of 1,3-butadiene over 1-butene, that is, the initial step of the hydrogenation of 1,3-butadiene on Pt(111). Herein, we now address the next reaction step, namely, how ultrathin layers of the IL [C8C1Im][PF6] influence olefin displacement from Pt(111). Ultrathin films of IL with thicknesses < 1 nm are prepared in situ by physical vapor deposition. Using temperature-programmed X-ray photoelectron spectroscopy (TPXPS), we track structural and compositional film changes and olefin desorption with increasing temperature. We find that i) IL deposition onto a saturated 1-butene layer enhances the displacement and desorption of 1-butene by a factor of 2.8; ii) 1,3-butadiene remains unaffected by the IL; and iii) IL decomposition on Pt(111) is shifted to higher temperatures by 80 ± 10 K.
Keywords: Ionic Liquid; Temperature-programmed XPS; Desorption; UHV; SCILL