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Few studies focus on the simultaneous removal performance and mechanism of H 2 S and SO 2  mixture in Claus tail gas with a high concentration of H 2 O (20–30 vol.%) and CO 2  (8–10 vol.%). In this paper, the effects of H 2 O and CO 2  on the simultaneous removal of H 2 S and SO 2  for the by activated carbon (TL-1) were studied. Fresh (TL-1-F) and desulfurisation sulfur-loaded TL-1 activated samples (TL-1-E1 and TL-1-E2) were characterised by BET, elemental analysis, TG-MS, FT-IR and XPS. The simultaneous adsorption mechanism of H 2 S and SO 2  on TL-1 in the presence of H 2 O and CO 2  was discussed. Results show that the breakthrough sulfur capacity of TL-1 for the simultaneous removal of H 2 S and SO 2  mixture reaches up to 301.6 mg S/g  ads  when the feed gas containing 30 vol.% H 2 O and 8 vol.% CO 2 , which is 40% higher than that without H 2 O. H 2 O in the feed is adsorbed on the surface of TL-1 and forms a water film. The adsorbed H 2 S and SO 2  are dissolved and ionised in the water film, which is conducive to the adsorption removal of H 2 S and SO 2  by TL-1 and the generation of sulfuric acid (55.8%) and S 8  (44.2%). Meanwhile, CO 2  is only physically adsorbed on the surface of TL-1, and does not participate in the chemical adsorption (or chemical reaction) for the removal sulfide process.

Effect of CO 2 /H 2 O on adsorptive removal of H 2 S/SO 2 mixture