Abstract
UV-VIS spectroscopic investigations were carried out on several sulphur-compounds to attribute the absorption bands (290, 302, 330 nm) observed by in-situ reflectance spectroscopy to particular SxO y 2− and S x 2− species. It was possible to assign the absorption bands to S2O 3 2− , S 2 2− and S2O 4 2− . These species are relevant in the catalytic oxidation of H2S over alumina.
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