Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Poster: Supported Nanoclusters and Catalysis
O 33.6: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
Operando ambient pressure HAXPES studies of Cu/ZnO(10-14) and Cu/ZnO(000-1) model catalysts for methanol synthesis — •Heshmat Noei1, Robert Gleißner1, Pauline Schütt2, Michael Wagstaffe1, Christopher Goodwin3, Markus Soldemo3, Mikhail Shipilin3, Patrick Lömker3, Christoph Schlueter1, Peter Amann3, Gregor Feldbauer4, Anders Nilsson3, and Andreas Stierle1 — 1Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — 2Universität Hamburg Department of Physics, Hamburg, Germany — 3Stockholm Universitet, Department of Physics, Sweden — 4Institute of Advanced Ceramics, TU Hamburg, Germany
The vicinal ZnO(10-14) facet recently gained scientific interest for its high density of surface steps and outstanding stability [1]. It has the lowest formation energy in comparison with other mixed-terminated facets such as (10-10) or (11-20) and therefor can be expected to play a distinct role in Cu/ZnO/Al2O3 powder catalysts [2]. We investigate the growth and morphology of the Cu nano particles on the vicinal ZnO surface under UHV conditions. Ambient Pressure XPS studies reveal the higher abundance of reaction intermediates for Cu/ZnO(10-14) in comparison to the Cu/ZnO(000-1) system on the surface of these model catalysts. Switching from CO/H2 over CO/CO2/H2 to CO2/H2 conditions and vice versa revealed complete reversibility. References [1] H. Zheng, Phys. Rev. Lett. 2013, 111, 086101. [2] K.S. Chan, Appl. Phys. Lett. 2015, 106, 212102.
Keywords: Heterogeneous Catalysis; Operando; Hard-X-ray Photoemission Spectroscopy; Methanol synthesis; Cu NPs on Vicinal ZnO surface