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二苯并噻吩及其加氢中间体在体相金属磷化物上的加氢脱硫反应.docx

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二苯并噻吩及其加氢中间体在体相金属磷化物上的加氢脱硫反应 Title:HydrogenationandDesulfurizationReactionsofDibenzothiopheneanditsHydrogenationIntermediateonHeterogeneousMetalPhosphides Introduction: Dibenzothiophene(DBT)anditshydrogenationderivativesplayasignificantroleintheproductionofcleanfuelsandchemicalsduetotheirpresenceinsulfur-containingcrudeoilfractions.ThedesulfurizationofDBTisoneofthemostcriticalstepsinthehydrodesulfurization(HDS)processfortheupgradingofpetroleum,assulfurcompoundsaremajorcontributorstoairpollutionandcatalystpoisoning.TheuseofmetalphosphidecatalystsinthehydrogenationanddesulfurizationofDBTanditsintermediateshasgainedattentionfortheirhighcatalyticactivityandselectivityinsulfurremoval.ThispaperaimstoreviewtherecentadvancementsandmechanismsofhydrogenationanddesulfurizationreactionsofDBTanditshydrogenationintermediatesonheterogeneousmetalphosphides. Hydrogenationofdibenzothiophene: ThehydrogenationofDBTinvolvestheadditionofhydrogenatomstoitsaromaticring,therebysaturatingthemolecule.Thereactioncanproceedviathehydrogenationofthearomaticdoublebondsorthecleavageofcarbon-sulfurbondsfollowedbyhydrogenation.Metalphosphides,suchasMoP,Ni2P,andCo2P,haveshownpromisingcatalyticactivityforthisreaction.Thesynergisticeffectbetweenmetalandphosphorusinthesecatalystsenhanceshydrogenactivation,improvingtheoverallhydrogenationefficiency.Severalstudieshaveinvestigatedtheeffectofdifferentparameters,suchastemperature,pressure,reactantconcentration,andcatalystmorphology,onthehydrogenationperformance.TheseinvestigationshaveprovidedinsightsintothereactionkineticsandoptimalreactionconditionsfortheselectivehydrogenationofDBT. Desulfurizationofdibenzothiophene: Desulfurizationisachallengingprocessduetothehighstabilityofthecarbon-sulfurbondinDBT.MetalphosphideshavebeenreportedtoeffectivelycatalyzethedesulfurizationofDBTtoproduceitscorrespondinghydrodesulfurizedproduct,biphenyl.ThedesulfurizationmechanisminvolvestheadsorptionofDBTonthecatalystsurface,followedbythecleavageofcarbon-sulfurbondsandsubsequent