Reaction of H2S with Adsorbed Oxygen Atoms on Platinum (111)

摘要

The reaction of H2S(g) and adsorbed atomic oxygen on Pt(111) had been studied by SIMS, HREELS, and TPD. H2S(g) reacts completely at 96 K with 0.22 ML O(a) to give H2O(a) and S(a). The reaction rate shows no measureable temperature dependence between 96 and 135 K and under the conditions of this study, was equal to the flux of H2S. After a saturation dose of H2S on O(a)/Pt(111), only H2S, H2 and H2O desorbed in TPD. HREEL spectra provide evidence of water clustering when H2S exposure continues beyond the amount necessary for complete reaction of the adsorbed O atoms. Keywords: Hydrogen sulfides, Hydrogen, Platinum, Reprints. (mgm)