Reactivity of Oxygen in Methanol Partial Oxidation over Au(111) Model Catalyst Surface
Доклады на конференциях
The partial oxidation and alcohols oxidative coupling on gold requires the presence of adsorbed atomic oxygen. Although molecular O2 does not dissociate on the gold surface, atomic oxygen layers can be prepared by ozone decomposition. In the current work, we investigated the different oxygen species on the Au(111) model catalyst surface and their reactivities in methanol partial oxidation. Adsorbed oxygen layers prepared at various temperatures reveal drastically different reactivities towards methanol: the oxygen layers prepared at 140 K demonstrate higher activity than that of 460 K. With increasing temperature, the active oxygen species were observed to transform into inactive oxygen. The XPS and TPD analysis of oxygen layers reveal the presence of inactive subsurface oxygen at higher temperatures. Current results are critically important for the molecular understanding of the fundamental aspects of oxidative catalysis by gold.