Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 39: Heterogeneous Catalysis
O 39.1: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
High-resolution X-ray photoelectron spectroscopy investigations of the reaction of C2H4 and C6H6 on carbide-modified Mo(110) — •Udo Bauer, Christoph Gleichweit, Oliver Höfert, Christian Papp, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen
Carbide-modified molybdenum surfaces have been proposed as noble metal-free catalysts for a variety of reactions, among them the dehydrogenation of hydrocarbons. The modification of Mo surfaces by carbon changes their reactivity towards the behavior of Pt-group metals. Herein, we study and compare the adsorption and reaction of ethylene and benzene on both a thin and a thick carbide layer on Mo(110) in-situ using synchrotron based high-resolution X-ray photoelectron spectroscopy (HR-XPS). Near edge X-ray absorption fine structure (NEXAFS) measurements are used for the identification of the adsorption geometry of the intact molecules and their reaction intermediates, whereas complementary temperature programmed desorption (TPD) experiments revealed the hydrogen evolution on both surfaces. The reaction pathway of all systems was followed by temperature programmed HR-XPS, which enabled us to determine intermediate species during reaction. When comparing the data of both thin and thick carbide overlayers, we only found minor differences concerning the reactivity towards ethylene and benzene. The work was supported by the Cluster of Excellence ’Engineering of Advanced Materials’ of the University Erlangen-Nürnberg.