Abstract
The formation and the reactivity of V-oxide/Rh(111) inverse catalyst surfaces has been investigated by reflection absorption infra red spectroscopy (RAIRS), varaiable-temperature scanning tunneling microscopy (VT-STM) and thermal programed desorption (TPD), The oxidation of metallic V island structures deposited on Rh(111) at room temperature has been monitored in situ at 200 °C and 400 °C by VT-STM and RAIRS, leading to small-island and large-island morphologies, respectively. The different reactivities of the generated inverse catalyst surfaces have been probed using the adsorption and oxidation reaction of CO. It is shown that the small-island V-oxide/Rh(111) catalyst exhibits enhanced reactivity in the oxidation of CO and is more easily subjected to oxide reduction. This is ascribed to the significant influence of the metal-oxide phase boundary on the catalyst activity.
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