Regensburg 2025 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Materials for the Storage and Conversion of Energy

MM 12.6: Vortrag

Dienstag, 18. März 2025, 11:45–12:00, H22

Advanced Electron Energy Loss Spectroscopy techniques in catalyst analysis — •Daniela Ramermann, Michael Poschmann, Christoph Göbel, Wenchao Wan, Elisabeth H. Wolf, Saskia Heumann, Holger Ruland, and Walid Hetaba — Max-Planck-Institut für Chemische Energiekonversion, Mülheim an der Ruhr

Electron energy loss spectroscopy (EELS) is a powerful technique that gives access to the electronic structure of the sample, enabling analysis of elemental composition, chemical bonding and oxidation states. Combined with the high spatial resolution of a scanning transmission electron microscope, detailed analysis of a catalyst can be carried out, to gain knowledge about the structure-function relationship. In addition to spatially resolved oxidation state analysis, accessing spectra at higher energy losses than commonly used was recently reported.

We apply these techniques to investigate the oxidation states of a CuZn-based MeOH catalyst system spatially resolved, using self-measured standards. Furthermore, we give examples of the utilization of EELS at high energy losses on a Co-based ammonia decomposition catalyst.

Keywords: EELS; Catalysis; Oxidation; Spectroscopy; TEM