Abstract
SO 2 decomposition kinetics on the (111) face of Pt were investigated by AES. SO 2 exposure at saturation leads to a surface concentration of elementary sulfur, which is about half of that obtained by H 2S exposure. The increase of the S concentration with time is studied as a function of surface temperature and ambient SO 2 pressure. The experimental results lead to a model assuming stationary states of (SO 2) ad and (SO) ad + (O) ad to be established instantly, while SO dissociation is the rate limiting step for S enrichment. Additional experiments with CO coadsorption support this concept and allow together with studies of the reaction of elementary sulfur with oxygen to draw some conclusions on the energetics of the system SO 2/Pt(111).
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