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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.