Abstract
Abstract The spatial distribution of potassium under reaction conditions on a composite Pt/Rh catalyst has been studied employing photoelectron spectromicroscopy as in situ method during the H 2 +O 2 reaction. The composite catalyst consisted of a 70×70 μm 2 Pt domain on a Rh(110) surface predosed with a submonolayer coverage of potassium. This catalyst was exposed to an O 2 +H 2 atmosphere in the 10 −7 mbar range. The combination of chemical specific imaging with a spatial resolution of 0.12 μm and micro-spot spectroscopy provided direct evidence for lateral re-distribution of potassium into a stationary concentration pattern under reaction conditions. The identity of the adsorbed species in the pattern and the changes in the chemical state of the substrate were determined.
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