SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Poster: Oxide and Insulator Surfaces
O 68.5: Poster
Wednesday, March 29, 2023, 18:00–20:00, P2/EG
The Surface Chemistry of Hydrated Lime - Wave Optics tested on a Model System — •Nils Schewe1, Thomas Mayerhöfer2, Hicham Idriss1, and Christoph Wöll1 — 1Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany — 2Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, Jena, 07745, Germany
We report on the results of a combined experimental and theoretical study of the interaction of sulfur dioxide with a calcium hydroxide single crystal surface. Our investigation of this model system for flue gas desulfurization and concrete corrosion was carried out on the Ca(OH)2 (001) surface under ultra-high-vacuum conditions. Combining polarization resolved UHV infrared reflection absorption spectroscopy (IRRAS) with calculations based on wave optical considerations, we were able to demonstrate the adsorption behavior and mode of SO2 on this surface. We show, that the preferred angle of adsorption is 23 ° below 65 K. Heating does not lead to reaction, but fully desorbs the formed adsorbate after crystallization between 80 - 100 K. Additionally, we were able to obtain the first low energy electron diffraction (LEED) pattern of an alkaline earth metal hydroxide by using UHV exfoliation for cleaning.