Abstract
The adsorption and thermal evolution of SO 2 on a Pt(110) surface was studied by temperature programmed desorption, angle-resolved UV photoelectron spectroscopy and X-ray photoelectron spectroscopy. At 140 K two molecular SO 2 species are observed that are attributed to adsorption on different adsorption sites. Upon heating to 340 K atomic S and molecular SO 3 and SO 4 are formed with the amount of the various products depending on the initial SO 2 coverage. For high SO 2 coverages these reactions are accompanied by molecular SO 2 desorption. The SO 3 species decomposes upon further heating to 500 K leading to SO 2 desorption. SO 4, which is only formed for high initial SO 2 coverages, is stable up to this temperature but decomposes upon further heating to 650 K. In the same temperature range atomic sulphur and oxygen recombine to desorb as SO 2.
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