Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Catalysis and surface reactions – Poster
O 23.10: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Metal clusters on rutile TiO2(110) as model catalysts: Stability and reactivity under near-ambient pressure conditions — •Jonathan Paul, Marina Isabel de la Higuera Domingo, Lorenz Falling, Florian Kraushofer, Matthias Krinninger, and Barbara A. J. Lechner — Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, 85748 Garching, Germany
Clusters frequently exhibit strongly size-dependent catalytic properties and have discrete electronic states, often leading to a particularly high activity in heterogeneous catalysis. However, at the elevated temperatures typically employed in industrial applications, clusters tend to sinter into larger particles, which can lead to a decrease in catalytic activity. Reducible oxide supports, such as titania (TiO2), are effective materials for stabilizing clusters and can further modify their catalytic behavior through encapsulation effects induced by the strong metal-support interaction (SMSI).
Here, we employ near-ambient-pressure scanning tunneling microscopy (NAP-STM) to investigate how reducing, oxidizing and reaction atmospheres influence the stability, structural dynamics and geometry of Pt and Ni clusters supported on rutile TiO2(110).[1] Structural insights obtained from microscopy are complemented by a highly sensitive sniffer setup for activity measurements, investigation of reaction mechanisms and determination of turnover frequencies.[2]
[1] F. Kraushofer, et al. J. Am. Chem. Soc. 2025, 39846-39859.
[2] J. Reich, et al. Top. Catal. 2024, 880-891.
Keywords: Clusters; Titania; STM; NAP