Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Fundamentals of Catalysis II
O 82.7: Vortrag
Donnerstag, 4. April 2019, 16:30–16:45, H5
Defect dependent adsorption of tungsten oxide clusters on rutile TiO2 surfaces for model (photo-)catalysis — •Lars Mohrhusen, Maximilian Grebien, and Katharina Al-Shamery — Carl von Ossietzky University of Oldenburg, Institute of Chemistry, Oldenburg, Germany
Rutile TiO2 is one of the most intensively studied materials for heterogeneous thermal and photoinduced catalysis. In earlier publications, the importance of bulk and surface defects for the chemical reactivity of small molecules such as oxygen,[1] methanol[2] or benzaldehyde[3] has been demonstrated. In temperature programmed reaction spectroscopy (TPRS) and infrared reflection-absorption spectroscopy (IRRAS), different reaction pathways such as the reductive coupling, deoxygenation to hydrocarbons and partial oxidation were significantly dependent on the defect density as well as the presence of different oxygen species.
The deposition of (oxidic) cocatalysts[4,5] is a common approach to address the (photo-)catalytic performance. However, a detailed understanding is often missing. Here, we present systematic studies on rutile TiO2 (110) under well-defined ultra-high vacuum conditions illustrating the deposition of tungsten oxide clusters to control the defect density dependent adsorption and reactivity of small molecules.
[1] E. Lira et al., J. Am. Chem. Soc. 2011, 133, 6529. [2] M. Osmić et al., J. Phys. Chem. C 2018, DOI: 10.1021/acs.jpcc.8b02953 [3] P. Clawin et al., Chem. Eur. J 2014, 25, 7665. [4] C. Pang et al., Chem. Rev. 2013, 113, 3887 [5] J. Kim et al., Catal. Today 2007, 120, 186.