SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 81: Oxide and Insulator Surfaces I: Adsorption and Reaction of Small Molecules

O 81.5: Vortrag

Donnerstag, 30. März 2023, 16:00–16:15, CHE 91

Reactivity and Influence of Catalytic Support Materials - a combined in situ and operando Infrared Study of CeO2 — •Eric Sauter¹, Lachlan Caulfield¹, Alexei Nefedov¹, Florian Maurer², Daria Gashnikovina², Jan-Dirk Grunwaldt², and Christoph Wöll¹ — ¹Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany — ²Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany

For most catalytic reactions the morphology, oxidation state and support were found to have a strong influence on the catalytic activity. Investigation of the most active sites, the support material and its behavior under model as well as realistic conditions is a prerequisite for a comprehensive understanding of catalytic processes. With Infrared Spectroscopy the surface composition and interaction with water, as well as carbon monoxide, can be investigated. The combination of low temperature, UHV gas adsorption as well as operando DRIFTS was used to characterize CeO2 as catalytic support material. The adsorption of CO on single crystals was used as reference for the interpretation of more complicated spectra like powders or nanoparticles. The interactions with water have shown the high reactivity of the cerium oxide surface, which at the end leads to hydroxyl termination. With the use of in situ and operando Infrared spectroscopy the behavior of catalysts and their support material can be investigated, under realistic reaction conditions, into more detail.