Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 21: Poster Heterogeneous Catalysis

O 21.3: Poster

Monday, March 17, 2025, 18:00–20:00, P2

Model Catalytic Studies on the Thermal Dehydrogenation of the Benzaldehyde/Cyclohexylmethanol LOHC System on Pt(111) — •Marius Steinmetz¹, Valentin Schwaab^1,2, Felix Hemauer^1,2, Eva Marie Freiberger², Natalie J. Waleska-Wellnhofer², Hans-Peter Steinrück², and Christian Papp¹ — ¹Angewandte Physikalische Chemie, Freie Universität Berlin (FU Berlin), Arnimallee 22, 14195 Berlin, Germany — ²Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany

We investigated the dehydrogenation reaction and the thermal decomposition of the liquid organic hydrogen carrier (LOHC) pair benzaldehyde/cyclohexylmethanol on a Pt(111) model catalyst via temperature-programmed desorption experiments and synchrotron radiation photoelectron spectroscopy. The LOHC pair has a hydrogen storage capacity of 7.0 mass%, stored in a cyclohexyl ring and a primary alcohol group. We observed a stepwise dehydrogenation mechanism, starting with the dehydrogenation of the alcohol group, followed by the dehydrogenation of the cyclohexyl ring. We also observed different dehydrogenation behaviors for low and high coverages, probably caused by steric hindrance for high coverages. Even though the LOHC pair achieves high hydrogen storage capacity, early decomposition at low temperatures between 250 and 350K limits the use of the molecule pair as a reversible hydrogen carrier.

Keywords: LOHC; Platinum; TPD; XPS; Benzaldehyde/Cyclohexylmethanol