Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Metal Oxide Surfaces III: Adsorption and Reactivity

O 55.10: Vortrag

Mittwoch, 3. April 2019, 17:15–17:30, H5

(Photo-)oxidation Studies on Titania Rutile(110) — •Jessica Kräuter, Lars Mohrhusen, Tim Thiedemann, and Katharina Al-Shamery — Carl-von Ossietzky University of Oldenburg, Institute of Chemistry, Oldenburg, Germany

In chemical industry acetone is produced homogeneously catalysed by the cumene process with explosive peroxides as intermediates.^[1] To avoid these, heterogenous catalysed processes are discussed. Earlier work already demonstrated the photo-oxidation of 2-propanol to acetone on MnO, however with low yield.^[2] As titania is a well-known photocatalyst, we started model studies under UHV conditions on the interaction of 2 propanol and acetone adsorbed on a rutile TiO₂(110) surface. Titania was chosen as recently own work demonstrated the reductive coupling of benzaldehyde and the deoxygenation reaction of methanol which were influenced by bulk defects.^[3,4] We have also investigated the effect of oxygen and water coadsorption and tested the photocatalytic performance under UV irradiation. Here, we present Temperature Programmed Reaction Spectroscopy (TPRS) studies to monitor reaction products and polarized Fourier-Transformation Infrared Reflexion Absorption Spectroscopy (FT IRRAS) to identify possible reaction intermediates and their orientation on the surface.

[1] V. M. Zakoshansky, Petroleum Chemistry, 2007, 47, 4, 273. [2] H. Cao, S. L. Suib, J. Am. Chem. Soc., 1994, 116, 5334. [3] P. M. Clawin, C. M. Friend, K. Al-Shamery, A European Journal, 2014, 90, 7665. [4] M. Osmić, L. Mohrhusen, K. Al-Shamery, DOI: 10.1021/acs.jpcc.8b02953.