Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Metal Substrates: Adsorption of Atoms and Inorganic Molecules
O 95.7: Vortrag
Donnerstag, 23. März 2017, 16:45–17:00, WIL A317
Zn on Au(111) - Surface alloy formation and interaction with Oxygen — •Konstantin M. Schüttler and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
Methanol is a promising molecule for chemical energy storage, e.g., when using H2 from renewable sources for its synthesis. Au/ZnO was found to be a highly active catalyst for the synthesis of "Green Methanol" from CO2/H2 as a "Solar Fuel", suitable also for the specific operation conditions resulting from that application[1]. Previously, CuZn alloys have been used as model systems for the industrially used Cu/ZnO catalysts[2]. For Au/ZnO this approach is similarly plausible.
In order to gain more insight into the formation and nature of active sites, the formation, structure, electronic and chemical properties of bimetallic Zn/Au(111) surfaces serving as structurally well-defined 2D model catalysts were studied. The reactivity of Zn surface atoms, which may be crucial for the catalytic performance of ZnO supported MeOH synthesis catalysts, was studied by exposing Zn/Au(111) to oxygen. Also, the influence of temperature on Zn growth behavior was studied both by varying the Zn deposition temperature and by subsequent annealing. Resulting consequences of these findings on the structure of realistic Au/ZnO catalysts are discussed.
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