Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 3: Oberfl
ächenreaktionen I
O 3.2: Vortrag
Freitag, 4. März 2005, 11:00–11:15, TU EB420
Catalytic properties of UHV-prepared Au/TiO2-model systems at elevated pressures up to 100 mbar — •Thomas Diemant, Zhong Zhao, Hubert Rauscher, and R. J. Behm — Abt. Oberfächenchemie und Katalyse, Universität Ulm, 89069 Ulm
Oxide supported Au catalysts have found increasing interest because of their high activity for various oxidation and reduction reactions. For model studies under realistic reaction conditions we performed in-situ IR spectrocopy (PEM-IRAS) and rate measurements for CO oxidation on structurally (STM) [1] and chemically (XPS, CO-TPD) well-defined model catalysts, prepared by Au deposition on thin TiO2 films at pressures up to 100 mbar. Results for various Au particle sizes, temperatures, and partial pressures are presented and discussed in comparison with data obtained on real catalysts. Consequences for the reaction mechanism are derived.
[1] Zhong Zhao et al., DPG-Frühjahrstagung AKF Oberflächenphysik, Berlin (2005)