Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Poster Wednesday: Adsorption and Catalysis

O 71.2: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

Model catalytic studies of liquid organic hydrogen carriers: Indole/Indoline/Octahydroindole on Ni(111) — •Johann Steinhauer, Philipp Bachmann, Udo Bauer, Fabian Düll, Florian Späth, Hans-Peter Steinrück, and Christian Papp — Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen

The availability of energy from renewable sources is unsteady and unpredictable due to environmental influences. Therefore, energy storage becomes more important in the near future. One route to store energy in the form of hydrogen are liquid organic hydrogen carriers (LOHCs) that enable chemical storage of hydrogen. In an LOHC system, organic molecules are catalytically loaded with hydrogen to form an energy- and hydrogen-rich compound. Afterwards, hydrogen is catalytically unloaded. Recent studies identified the N-based heteroalicyclic system N-ethylcarbazole (NEC) as suitable LOHC (hydrogen capacity of 5.8 wt%). Herein, we present detailed studies on the LOHC system indole, with the hydrogen-rich octahydroindole (hydrogen capacity of 6.4 wt%), the dehydrogenation intermediate indoline and the hydrogen-lean indole. This system is investigated in a model approach on a Ni(111) surface under ultra-high vacuum conditions. HR-XPS and TPD are used to provide insights in the adsorption, desorption and reaction behavior of the LOHC system. We will present a detailed description of the reaction pathway and discuss the use of this system for chemical hydrogen storage. A comparison and evaluation of the differences to the known system H12-NEC / NEC will be presented.

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