Reactions of gaseous pollutants with solids
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Many desulfurization processes involve the pickup of H2S by a solid absorbent, but the surface chemistry is not understood. Consequently, IR spectra were recorded of H2S chemisorbed at 25°C by a calcined dolomite, CaO, and MgO in order to provide information about the nature of the molecular species formed on the solid's surfaces. H2S was sorbed even at low pressures, forming a layer of hydroxyls and a half-layer of S−; further reaction led to H2O formation and the conversion of the oxide surfaces into sulfide surfaces. SH− groups were detected only with MgO. Heating the H2S-treated adsorbents in O2 led to the oxidation of the sulfides to sulfites and to sulfates.
KeywordsOxidation Sulfate Sulfide Hydroxyl Dolomite
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