Sulfidation and Regeneration of Nano-Fe-ZnO Desulfurizer at Ambient Temperature

In order to reduce the application cost of nano-ZnO desulfurizer,and to avoid its secondary pollution on environment,sulfidation and regeneration of Fe-doped nanosized ZnO desulfurizer(FZ5.0) prepared by homogeneous precipitation were studied.XRD,XPS,TEM and other characterization means were used to analyze the structure of FZ5.0 before and after sulfidation and regeneration.The results show that there exist three desulfurization products on the surface of desulfurizer,ZnS and adsorption species of HS and S could be regenerated by directly pumping air for five times at 370 ℃.The structure of the nanosized desulfurizer tends to be stable after the first regeneration,and shows stable desulfurization activity in the following reusing process.The desulfurization activities of the regenerated desulfurizer are about 50% of those of fresh desulfurizer.SO2 is the primary product and there is a small amount of sulfates produced in the regeneration,and particles size and appearance of regeneration samples changed little,but their surface area and pore volume change obviously,which are the main reason for the decrease of desulfurization activities.