Abstract
The transition from the high- to low-rate branches of the CO oxidation reaction has been observed on the grain surfaces of a Pt foil using photoemission electron microscopy. Dark areas of the image (high work function) distinguish the oxygen-rich adlayer of the high-rate regime from the light areas (low work function) characteristic of the low-rate regime. Not all grains exhibit the transition; grain boundaries and surface imperfections act as nucleation centres. Preliminary data for the Pt(100) surface show surface corrugations on approximately the 0.5 mu m scale that serve as channels for C combustion during oxidation cycles and may relate to the activity of this surface for the CO oxidation reaction.
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