Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Catalysis and surface reactions – Poster
O 23.2: Poster
Monday, March 9, 2026, 18:00–20:00, P2
Support-Dependent Thermal Activation of Pt17 Clusters on HOPG and CeO2: For-mation of Active CO Oxidation Catalysts — Papri Chakraborty1, 2, 3, •Johannes Seibel2, Nicola Da Roit4, Artur Böttcher2, Ajai Raj Lakshmi Nilayam1, Christian Kübel1, Silke Behrens4, and Manfred Kappes1,2, 3 — 1Institute of Nanotechnology, KIT, 76344 Eggenstein-Leopoldshafen, Germany — 2Institute of Physical Chemistry, KIT, 76131 Karlsruhe, Germany — 3Institute of Quantum Materials and Technologies, KIT, 76344 Eggenstein-Leopoldshafen, Germany — 4Institute of Catalysis Research and Technology, KIT, 76344 Eggenstein-Leopoldshafen, Germany
Atomically precise ligand-protected metal clusters are attractive precursors for heterogeneous catalysts, potentially allowing for the precise control of the initial active site composition. However, the transformation from the protected cluster to the active catalyst, specifically the removal of the ligand shell, remains a poorly understood process that depends heavily on the support material. Here, we present a comparative study of the thermal activation of Pt17(CO)12(PPh3)8(NO3)2 on inert graphite, on reactive ceria CeO2 surfaces and in gas phase. For this we combined thermal desorption spectroscopy with high-resolution mass and ion mobility spectrometry to map the decomposition pathway of the cluster. Additionally we probed clusters supported on CeO2 before and after CO oxidation catalysis with transmission electron microscopy. This revealed dissociation of clusters and dispersion of the Pt atoms on the oxide support under certain reaction conditions.
Keywords: Catalysis; CO oxidation; Pt cluster