Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 8: Metal Substrates I: Adsorption and Reactivity
O 8.1: Vortrag
Montag, 1. April 2019, 10:30–10:45, H25
Interaction of AuZn surfaces with oxygen species and formation of ZnOx on Au(111) — •Konstantin M. Schüttler, Albert K. Engstfeld, Joachim Bansmann, and R. Jürgen Behm — Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
Au/ZnO is a highly active catalyst for the synthesis of "Green Methanol" from CO2 and H2, where the latter should stem from renewable sources [1]. Industrially, Cu/ZnO is used for MeOH synthesis, where under reaction conditions ZnO at the perimeter of the Cu nanoparticles is partly reduced, forming bimetallic CuZn sites [2]. For Au/ZnO catalysts, AuZn formation would be similarly plausible.
In order to gain more insight into the formation, structural, electronic and chemical properties of AuZn sites, bimetallic Zn/Au(111) model catalyst surfaces were studied under UHV conditions. We investigated the interaction of Zn surface atoms with oxygen by exposing various AuZn nanostructures to molecular and atomic oxygen. Furthermore we illustrate the thermal stability of the newly formed nanostructures.
Second, we explored the formation of ZnOx/Au(111) (0≤x≤1) and studied the species formed depending on the oxidation conditions.
Consequences of these findings on our understanding of realistic Au/ZnO catalysts are discussed.
Y. Hartadi et al., ChemSusChem 8 (2015), 456
S. Kuld et al., Angew. Chem. Int. Ed. 53 (2014), 5941