The selective oxidation of H2S to elemental sulfur on the mechanicallymixed V2O5 -zeolite catalysts in IGCC system

摘要

Zeolite-NaX, which showed high activity for the selective oxidation of H2S under waterfreerncondition, was deactivated by strong adsorption of sulfur compounds formed duringrnreaction. Among the transition metal oxides tested for the selective oxidation of H2S, V2O5rnshowed the highest conversion of H2S and selectivity of elemental sulfur. The conversion of H2Srnon V2O5 in the presence of water vapor at 200 ℃ was 75% , 17% lower than that under waterfreerncondition, which was caused by the degraded reduction of V2O5. The degraded reduction ofrnV2O5 could be alleviated by mechanically mixing with zeolite-NaX or –KX. The conversion ofrnH2S on V2O5 mechanically mixed with zeolite-NaX or –KX was about 85%, which was 10%rnhigher than that on unmixed V2O5 under the same reaction condition. The conversion could bernmaintained very well with a coal-derived synthesis gas. It could be concluded that the selectivernoxidation of H2S can be applied to the hot gas cleanup in IGCC system.