Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 88: Catalysis and surface reactions III
O 88.6: Vortrag
Donnerstag, 12. März 2026, 16:15–16:30, TRE/MATH
Competing reaction pathways in decomposition of 2-propanol over V-doped Co3O4(111) model catalyst: a mechanistic study. — •Patrick Hubert1, Jan Smyczek1, Maximilian Galinski1, Lina Marquardt1, Justin Girschik1, Philipp Fredersdorff1, Paul Fröhlich1, Bernd Hartke1, Guntram Rauhut2, and Swetlana Schauermann1 — 1Institute of Physical Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str. 1, 24118 Kiel, Germany. — 2Insitute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
This study investigated catalytic decomposition of 2-propanol over Co3O4(111)/Au(111) and VOx/Co3O4(111)/Au(111) model catalysts to unravel competing reaction pathways toward acetone or propene. Ultra-high vacuum (UHV) surface science techniques were employed, including scanning-tunneling microscopy (STM), molecular-beam methods, infrared reflection absorption spectroscopy (IRAS), and temperature-programmed desorption (TPD). The VOx/Co3O4(111)/Au(111) surface exhibits structures with V3+, V4+ adsorption sites and vanadyl groups (V=O). TPD measurements showed propene desorption at 480 K from 2-propanol adsorbed at 100 K on surfaces exceeding 0.6 ML VOx coverage. At 180 K, 2-propanol dissociatively adsorbs on VOx, consuming vanadyl groups during OH deprotonation, forming tilted 2-propoxy with surface-proximal methyl groups. At 400 K, a second intermediate forms via C-O bond scission and methyl deprotonation. IR spectra suggest this intermediate is a surface-bound propene-derived species.
Keywords: model heterogeneous catalysis; cobalt oxide; vanadium oxide; selective dehydrogenation; reducible oxides