SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Supported Nanoclusters: Structure, Reactions and Catalysis

O 29.4: Vortrag

Dienstag, 28. März 2023, 11:15–11:30, CHE 91

Methane activation towards H2 evolution with sub-nanometer Ta clusters supported on Pt(111) — •Tobias Hinke, Kevin Bertrang, Matthias Knechtges, Sebastian Kaiser, and Ueli Heiz — TU Munich, School of Natural Sciences & CRC, Physical Chemistry

The tremendous global energy demand leads to resource shortages as well as environmental consequences. Employing H2 as an alternative energy carrier from abundant feedstocks such as natural gas is one strategy to tackle these issues. However, efficient hydrogen evolution demands for a fundamental understanding to increase H2 availability. For this, model systems can be used to elucidate basic principles in chemical reactions, facilitating the design of tailored catalytic systems. Studies of small cationic Ta-clusters and their oxides in the gas phase exhibit high activity towards the activation of highly inert CH4, yielding Hydrogen, whereas the cluster charge was identified as a key parameter.
These studies are now extended to their supported analogues to approach common catalytic structures. Therefore, Tan-clusters (n < 30) supported on metal single crystal substrates are investigated under mild conditions in UHV, with regards to their activity towards H2 evolution from CH4 via TPD. Characterization was performed via XPS and STM. Supported Ta8 clusters exhibit size dispersive stability at room temperature and are active towards H2 evolution form CH4.
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