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O: Fachverband Oberflächenphysik
O 70: Supported nanoclusters: Structure, Reactions, Catalysis
O 70.8: Vortrag
Donnerstag, 8. September 2022, 17:00–17:15, H6
Surface Ligand Infrared Spectroscopy: In-Situ Characterization of Noble Metal Clusters and Metal Oxides at Work — •Eric Sauter1, Daria Gashnikova2, Florian Maurer2, Alexei Nefedov1, Stefan Heißler1, Yuemin Wang1, Jan-Dirk Grunwald2, and Christof Wöll1 — 1Intitute of Functional Interfaces, KIT, Eggenstein-Leopoldshafen, Germany — 2Institute of Chemical Technology and Polymer Chemistry, KIT, Karlsruhe, Germany
To achieve a full understanding of chemical processes at exposed surfaces in-situ and operando investigations are required. For studies of catalytic processes under real conditions, IR spectroscopy offers a number of advantages. In the present study, surface ligand infrared spectroscopy was used to perform an in-situ investigation of the surface characteristics of cerium oxide single crystals as well as catalytic active NM-clusters on cerium oxide nanoparticles. Low temperature adsorption of carbon monoxide was used to identify the surface structure and morphology, visible through distinctive adsorption bands blue shifted in respect to the gas phase, which can be used as reference for the interpretation of more complicated spectra like powders or nanoparticles. Additionally, noble-metal clusters were investigated in pristine condition as well as in the reduced state. Upon heating, desorption of the probe molecule occurred and at higher temperatures deformation and sintering of the clusters was observed. The investigation shows the power of infrared spectroscopy as a tool for in-situ investigations and characterization of NM-clusters and metal oxides at work.