简介：Withcoalgasasareducingagent,thecatalyticreductionofSO2tosulfurinthefluegasproducedinmetallurgicalprocesseswasstudiedovercatalystsofrareearth-Fe/Al2O3(REFe/Al2O3).ThecatalyticactivityoftheREFe/Al2O3catalystonthereductionofSO2tosul-furwasinvestigatedbasedonkindsandthecontentsofrareearthsanddifferentpreparationmethodofthecatalyst.Additionally,themecha-nismofthiscatalyticreductionreactionwasalsoexplored.ResultsshowedthatdifferentrareearthimposeddifferenteffectontheactivityoftheFe/Al2O3catalyst.Especially,theadditionofSmandDygreatlyimprovedthecatalyticactivityofFe/Al2O3.TheyieldofsulfuroverSmFe/Al2O3wasincreasedto86.62%at360℃,whichwas40.5%higherthanthatoverFe/Al2O3atthesametemperature;andthesulfuryieldoverDyFe/Al2O3wasincreasedto91.62%at400℃,26.4%higherthanthatoverFe/Al2O3.ThecatalyticactivityofREFe/Al2O3wassomehowdependentonthecontentofrareearth.ForSmFe/Al2O3,thecontentofSmwasoptimizedtobeabout1.0wt.%.Therareearthcatalystpreparedwithdifferentmethodsalsoshowedvariedactivity.Thesulfuryieldoverrare-earthtransitionmetalcatalystsfollowstheorder:SmandironsolutionmixingimpregnationSmfirst,thenironsolutionimpregnationironfirst,thenSmsolutionimpregnation.ThereactionmechanismofSO2reductiontosulfurwithcoalgaswasproposedtobeanintermediatemechanism.