Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 104: Oxides and Insulators: Adsorption I

O 104.1: Vortrag

Donnerstag, 15. März 2018, 16:45–17:00, MA 041

Bulk Defect Dependent Adsorption of Acetone on Rutile TiO₂(110) — •Jessica Kräuter and Katharina Al-Shamery — Carl von Ossietzky University of Oldenburg, Institute of Chemistry, D-29129 Oldenburg

In chemical industry acetone is produced by the cumene process using peroxides. As alternative to get rid of the explosive peroxides a heterogeneous catalyzed process on TiO₂ is considered. As first step the adsorption of acetone on rutile TiO₂(110) was studied. Recently, an influence of the temperature dependent mobility of bulk defects on the reductive coupling of benzaldehyde was concluded from own work.[1] In previous coverage dependent studies on acetone and coadsorbed molecular oxygen the occurrence of a diolate species has been identified with surface science methods on a medium reduced rutile single crystal at liquid nitrogen temperatures.[2,3] Here we present the influence of bulk defects from studies on temperature dependent adsorption of acetone coadsorbed with molecular oxygen and oxygen adatoms. On a more strongly reduced rutile(110) single crystal a diolate species can be observed even without oxygen coadsorption. Furthermore, in TPRS an additional surface species appeared from 235 to 274 K when coadsorbing acetone with oxygen which has not been reported before. A possible β hydroxy ketone formation was identified by polarization dependent IRRAS measurement. [1] P. M. Clawin, C. M. Friend, K. Al-Shamery, A European Journal, 2014, 90, 7665. [2] M. A. Henderson, J. Phys. Chem. B, 2008, 108, 18932. [3] N. G. Petrik, M. A. Henderson, G. A. Kimmel, J. Phys. Chem. C., 2015, 119, 12273.