SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster: Supported Nanoclusters
O 41.3: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
H2 Evolution from Methane Activated by Ta8 Clusters on Pt(111) — •Matthias Knechtges, Tobias Hinke, Kevin Bertrang, Sebastian Kaiser, Nikita Levin, Martin Tschurl, and Ueli Heiz — TU Munich, School of Natural Sciences & Catalysis Research Center, Chair of Physical Chemistry
Methane as the main component of natural gas contains the highest energy density of all hydrocarbons but the activation poses great challenges, due to the high activation barrier of the C-H bonds.
Pathways to convert methane into valuable products at mild conditions are investigated in the UHV. Gas phase studies revealed that Ta8O2+ catalytically converts methane to ethane and hydrogen at room temperature. The charge and oxygen density of the clusters appear to have great impact on their activity towards methane[1].
By employing a substrate manipulating the electronic and geometric structure of the clusters, the model system approaches to industrial heterogenous catalysis. Therefore, metallic Ta8 clusters were deposited on different surfaces known for their electron drawing properties in analogy to the oxygen atoms in the Ta8O2+. While no activity towards methane was observed Ta8/SiO2, hydrogen evolution was found after methane exposition on Ta8/Pt(111) in temperature programmed desorption(TPD) experiments.
Characterization by scanning tunnel microscopy showed randomly monodispersed flat arrangements and XPS to observe oxidation states.
[1] N.Levin et.al J.Am.Chem.Soc. 2020, 142, 12, 5862-5869