The activity of cobalt molybdate and related catalysts in the oxidation of hydrogen sulfide at concentrations below 4000 ppm has been studied. The effect of oxygen concentrations up to 4.3% and water vapor concentrations up to 12% is described. Cobalt molybdate and mixtures of cobalt and molybdenum oxides supported on a-alumina were the most effective catalysts and at 25OoC allowed the reduction of hydrogen sulfide to levels below its odor threshold provided that the initial concentration of hydrogen sulfide did not exceed 1000 ppm. The effect of sulfiding on catalyst activity was examined and a possible method for regeneration is described.
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