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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.104: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

An Overview of Methanol Reactions on Ru based Catalyst Surfaces under UHV Conditions — •Pawel Gazdzicki and Peter Jakob — Fachbereich Physik, Philipps-Universität Marburg, Deutschland

The conversion of methanol to CO₂ is of substantial importance referring to the direct methanol fuel cell where CO from methanol dehydrogenation is responsible for the poisoning of the electrodes. In this comprehensive study thermally induced reaction pathways (T=20−600 K) of methanol on various Ru based catalysts (Ru(0001), (sub)monolayer Cu/Ru(0001), Cu(111)/Ru(0001), pseudomorphic Pt/Ru(0001) and Pt_xRu_1−x/Ru(0001) surface alloys) have been investigated in detail using Fourier transform infrared spectroscopy, temperature programmed desorption and photoelectron spectroscopy. Particular interest is devoted to the influence of preadsorbed oxygen on the formation and stability of the various reaction intermediates. Among the various stable surface species hydroxyl, formaldehyde, formate, methoxy and carbon monoxide have been identified. A reaction scheme is presented to illustrate trends.