Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Poster: Supported Nanoclusters and Catalysis

O 33.7: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Advancing Single-Atom Catalysis: Developing a New Apparatus for Near-Ambient Pressure Applications — •Johannes Filzmoser, Adam Lagin, Jiri Pavelec, Ulrike Diebold, Michael Schmid, and Gareth S. Parkinson — TU Wien - Institute of Applied Physics - Wiedner Hauptstraße 8-10, 1040 Vienna, Austria

Single-atom catalysts (SAC) are much-studied in surface science due to their great potential in heterogeneous catalysis. Model systems consisting of metal adatoms on single-crystal metal-oxide surfaces are being investigated in ultra-high vacuum (UHV) to understand the fundamentals of SAC. A step towards industrial SAC systems is an examination of idealized model systems under more realistic conditions, i.e., at elevated pressures and temperatures. This work aims to develop a UHV-compatible reaction cell, enabling sample exposure to gases at about 1 mbar pressure and temperatures up to 300°C. The composition of the exhaust gas from the reactor is quantitatively analyzed by mass spectrometry. Due to the low number of active sites on model SAC, measuring turnover frequencies presents a significant challenge. Therefore, we are investigating methods to optimize detection techniques.

Keywords: Single Atom Catalysis; Near Ambient Pressure; Measurement Setup Development; Gas Composition Analysis; Mass Spectroscopy