Spatio-Temporal Pattern Formation on Polycrystalline Platinum Surfaces During Catalytic CO Oxidation
Engineering, Chemical Engineering, Catalysis and Reaction Engineering, Material Science and Engineering, Polymer and Organic Materials
The individual grains of a polycrystalline platinum surface as well as the spatio-temporal concentration patterns associated with catalytic oxidation of carbon monoxide were imaged by means of photoemission electron microscopy (PEEM). For CO and O2 partial pressures in the 10−4 mbar range and at temperatures between 420 and 560 K different categories of pattern formation are observed which may be correlated with similar features observed previously with low-index single crystal planes, namely bistable behavior, propagating reaction fronts as well as spirals and target patterns. A novel effect concerns the appearance of regions with work functions considerably below those of the respective clean surfaces which are presumably due to the formation of subsurface oxygen species.
Digital Object Identifier (DOI)
Postprint version. Published in Surface Science, Volume 294, Issue 1-2, 1993, pages 116-130.
© Surface Science, 1993, Elsevier
Lauterbach, A.J., Haas, G., Rotermund, H.H., Ertl, G. (1993). Spatio-temporal pattern formation on polycrystalline platinum surfaces during catalytic CO oxidation. Surface Science, 294(1-2), 116-130.