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O: Fachverband Oberflächenphysik
O 81: Catalysis and surface reactions II
O 81.1: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, TRE/MATH
Pd/Cu single atom alloys for selective alcohol dehydrogenation: from single crystalline to nanostructured model catalysts — •Philipp Alexander Fredersdorff1, Jan Smyczek1, Carsten Schroeder1, Paul Froehlich1, Paul Kohlmorgen1, Stephan Appelfeller2, Konstantin Neyman3, and Swetlana Schauermann1 — 1Institute of Physical Chemistry, University Kiel, 24118 Kiel, Germany — 2MAX IV Laboratory, Lund University, 22100 Lund, Sweden — 3Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTC-UB), Universitat de Barcelona, Barcelona 08028, Spain
Single-atom alloy (SAA) catalysts offer atomic-level control of selectivity, yet structure reactivity relationships in realistic systems remain insufficiently understood. Here, we report the first preparation of well-defined Pd/Cu single-atom alloy nanoparticles under UHV on Al2O3/NiAl(110) and investigate their properties using IRAS CO titration, STM, and TPD. Temperature-dependent Pd de-aggregation shows the same behaviour as on Pd/Cu(111), with optimal incorporation at 550 K. Both de-aggregated materials catalyze the non-oxidative dehydrogenation of butanol, but only the nanostructured Pd/Cu-NP SAA achieves 100 percent selectivity, completely suppressing CO formation. A Pd-coverage-dependent analysis reveals that cluster formation rapidly decreases aldehyde selectivity on single-crystal Pd/Cu(111), whereas the newly developed nanostructured SAA catalysts maintain full selectivity across a wide Pd range.
Keywords: Single-Atom Alloys (SAA); Material Gap; Nanostructured Model Catalysts; Surface Spectroscopy (IRAS, TPD, STM); Selective Alcohol Dehydrogenation