Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Metal & Semiconductor substrates: Adsorption and reaction of small molecules – Poster

O 31.5: Poster

Montag, 9. März 2026, 18:00–20:00, P2

TPD Studies of Metal-Substrate Interactions in LOHCs and Polyfluorinated Compounds — Kassandra Zoltner, •Evelyn Versok, Leonard Neuhaus, Stefan R. Kachel, and J. Michael Gottfried — Fachbereich Chemie und mar.quest, Philipps-Universität Marburg, Germany.

Metal-substrate interactions critically govern catalytic reaction pathways and degradation mechanisms. Here, we investigate two chemically contrasting classes of adsorbates - hydrogen-rich liquid organic hydrogen carriers (LOHCs) and fluorocarbons - to clarify their stability and reactivity on metal surfaces. LOHCs such as decalin and tetralin are attractive hydrogen-storage materials but are prone to side reactions and catalyst-induced decomposition. In contrast, fluorocarbons including all-cis-hexafluorocyclohexane and perfluoromethylcyclohexane exhibit exceptional thermal and chemical stability, which is technologically valuable yet contributes to unwanted environmental persistence. Understanding molecule-metal interactions is therefore important for both hydrogen-storage chemistry and fluorocarbon degradation strategies. We employ temperature-programmed desorption (TPD) to determine adsorption energies, reaction kinetics, and product distributions. Systematic analysis of the selected LOHCs and fluorinated compounds on Au(111), complemented by comparison with partially dehydrogenated and defluorinated analogues, reveals detailed metal-induced transformation pathways. These insights advance the mechanistic understanding of hydrocarbon and fluorocarbon degradation on metal surfaces and support catalyst development.

Keywords: TPD; Catalytic Degradation; Liquid Organic Hydrogen Carriers; Fluorinated Organic Compounds; Metal-Substrate Interaction