Role of Iron in Hydrogen Sulphide Removal from Hot Gas

Abstract

Yields of SO₂ formed during H₂S removal from N₂ + H₂S mixture at 800°C in the presence of Fe₂O₃, Mn-nodule and red mud have been determined. The largest yields were observed for Fe₂O₃ followed by Mn-nodule, whereas no SO₂ was detected in the presence of red mud. A mechanism for H₂S reaction with Fe oxides has been proposed involving the use of the component distribution in the clean gas as well as the Fe sulphides formed during adsorption. X-ray diffraction and Mossbauer spectroscopy have been used to determine the forms of Fe in the solids at the end of adsorption. FeS was the main sulphide which was always accompanied by FeS₂.