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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Metal Oxide Surfaces III: Adsorption and Reactivity

O 55.6: Vortrag

Mittwoch, 3. April 2019, 16:15–16:30, H5

Water and methanol adsorption on vicinal ZnO — •Elin Grånäs1, Björn Arndt1,2, Michael Busch3, Fredrik Johansson4, Christoph Seitz1, Konstantin Simonov4, Michael Wagstaffe1, Anders Sandell4, Henrik Grönbeck3, and Andreas Stierle1,21Deutsches-Elektron Synchrotron (DESY), Germany — 2University of Hamburg, Germany — 3Chalmers University of Technology, Sweden — 4Uppsala University, Sweden

Zinc oxide (ZnO) plays an important role in catalysis, where it is often used together with metal nanoparticles in important chemical reactions such as methanol synthesis and low temperature water-gas shift. The detailed reaction mechanisms and role of the ZnO are topics under discussion. Previously we have determined the structure of the bare vicinal ZnO(10-14) surface [1], here we continue with studies of how the under-coordinated Zn- and O-atoms on the surface interact with water and methanol under UHV conditions. Using x-ray photoelectron spectroscopy we have followed the evolution of species present on the surface as a function of coverage and temperature. The distribution of products reveal insights into the influence of the surface steps. Further, based on scanning probe microscopy and surface x-ray diffraction studies we will discuss structural changes occurring upon water exposure.

[1] E. Grånäs, M. Busch, B. Arndt, M. Creutzburg, G. Dalla Lana Semione, A. Schaefer, J. Gustafson, V. Vonk, H. Grönbeck, A. Stierle. "A non-polar, highly reactive vicinal oxide surface". In preparation.

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