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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 ...
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