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In the present paper removal of low concentration of hydrogen sulphide by its selective catalytic oxidation with Fe (III)-EDTA catalyst carried on fibrous ion exchangers has been described. The complex of trivalent iron converts hydrogen sulphide to elemental sulphur. Bivalent iron formed in the reaction is oxidized by the atmospheric oxygen, so complex of trivalent iron is continuously regenerated and the overall process can be accounted as pseudo-catalytic. The role of fibrous package is improving the mass-transfer between the gas and liquid, buffering the pH of absorbing solution and, probably, catalyzing the reactions of oxidation of sulphur and iron ions. It was proved that the filtering layers with anion exchange package are much more active in the catalytic processes of hydrogen sulphide removal than cation exchanger and inter materials. In the addition to the nature of the fibre-solution carrier the process of catalytic oxidation depends on concentration of hydrogen sulphide in the air, relative air humidity, the process time and the content of Fe-EDTA complex in the fibres. It has been established that application of the Fe(III)-EDTA/Fiban catalytic system, under appropriate conditions, led to nearly complete conversion of H2S to elemental sulphur.
