Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Catalysis and surface reactions I
O 34.8: Vortrag
Dienstag, 10. März 2026, 12:15–12:30, HSZ/0204
Promoting Role of Isolated Surface Hydroxyls on Selective Dehydrogenation of 2-Propanol over Co3O4 Catalyst — •Jan Smyczek1, Patrick Hubert1, Hauke Scheele2, Carsten Schröder1, Sharif Najafishirtari2, Paul Kohlmorgen1, Malte Behrens2, and Swetlana Schauermann1 — 1Institute of Physical Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str. 1, 24118 Kiel, Germany — 2Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str. 2, 24118 Kiel, Germany
This study investigates the catalytic decomposition of 2-propanol to acetone over Co3O4 catalysts, examining both powdered materials under ambient pressure and model Co3O4(111) surfaces in ultrahigh vacuum. Water pretreatment at elevated temperatures substantially enhanced acetone formation rates. Scanning tunneling microscopy and infrared spectroscopy revealed that high-temperature water pretreatment creates isolated hydroxyl groups (OsH) involving lattice oxygen atoms, whereas low-temperature deposition forms an extended, partly dissociated OH/H2O network layer. The role of isolated OsH groups can most likely be attributed to their function as hydrogen acceptors for H atoms leaving from either 2-propanol or the propoxy intermediate. Critically, dissociation occurs only with isolated OsH species, not within the extended OH/H2O network, which nearly completely suppresses both abstraction steps. The isolated OsH groups function as efficient hydrogen acceptors, proving substantially more effective than adsorbate-free lattice oxygen.
Keywords: model heterogeneous catalysis; selective dehydrogenation of alcohols; effect of solvents; hydroxyl groups; reducible oxides