Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 49: Oxide Surfaces 1
O 49.4: Vortrag
Mittwoch, 7. September 2022, 15:45–16:00, S053
Atomic scale studies of chromium species on Fe3O4(001) — •Moritz Eder1, Panukorn Sombut1, Chunlei Wang1, Matthias Meier2, Jiri Pavelec1, Cesare Franchini2,3, Michael Schmid1, Ulrike Diebold1, and Gareth Parkinson1 — 1Institute of Applied Physics, TU Wien, Austria — 2Faculty of Physics and Center for Computational Materials Science, University of Vienna, Austria — 3Department of Physics and Astronomy, Alma Mater Studiorum, Università di Bologna, Bologna, Italy
Chromium (Cr) ferrite catalysts are industrially employed for the water gas shift reaction in order to provide large amounts of molecular hydrogen.[1] However, the European REACH legislation requires the removal of hexavalent Cr from all catalysts used in industrial processes due to its toxicity. Consequently, alternative metals are sought to fulfill the role of Cr species in the corresponding compounds.[2] To this end, one needs a fundamental understanding of Cr on iron oxides. We present the investigation of Cr species on Fe3O4(001) by means of STM and XPS at room temperature. We show the behavior during exposure to water gas shift reactants and upon high-temperature treatment. The results are compared to the behavior of other transition metals[3] and discussed with respect to implications for applied catalysis.
[1] Häussinger, Lohmüller, Watson, Hydrogen, 2. Production. In: Ullmann’s Encyclopedia of Industrial Chemistry, 2011
[2] Glassner, Int. Surf. Technol.14, p. 36, (2021)
[3] Bliem et al., Phys. Rev. B 92, p. 075440 (2015)