Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 50: Semiconductor Substrates: Structure, Epitaxy, Growth and Adsorption

O 50.7: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Adsorption of acetone on TiO2 rutile(110) — •Jessica Kräuter, Milena Osmić, and Katharina Al-Shamery — Carl von Ossietzy University of Oldenburg, 26129 Oldenburg, Germany

For increasing selectivity and activity of heterogeneous catalysts it is necessary to get a fundamental understanding of the interactions between adsorbate and catalyst. Therefore, as a model system for chemical reactions the adsorption of aldehydes/ketones on a common catalyst like TiO2 rutile(110) is 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 the ketone acetone and co adsorbed molecular oxygen the occurrence of a diolate species has been identified 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 co adsorbed with molecular oxygen and oxygen ad atoms. On a more strongly reduced rutile single crystal a diolate species can be observed even without oxygen co adsorption. Furthermore, in TPRS an additional surface species appeared from 235 to 274 K when co adsorbing acetone with molecular oxygen which has not been reported before. Changes of the molecular orientation of acetone on the surface were also proven 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.