ACTIVATION OF COBALT-MOLYBDENUM HYDRODESULFURIZATION

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1、D.L.Trimmetal.(Editors),CatalystsinPetroleumRefining198923301990ElsevierSciencePublishersB.V.,Amsterdam-PrintedinTheNetherlandsACTIVATIONOFCOBALT-MOLYBDENUMHYDRODESULFURIZA-TIONCATALYSTS:INFLUENCEOFTHESULFIDATIONPROCE-DUREONTHEPHYSICO-CHEMICALPROPERTIESANDCATALYTICACTIVITYR.PRADAS

2、ILVY*,P.GRANGEandB.DEMONUnit6deCatalyseetChimiedesMat6riauxDivids,Universit6CatholiquedeLouvain,PlaceCroixduSud1,1348Louvain-la-Neuve(Belgium).*INTEVEPS.A.,Secci6ndeCatilisisAplicada,ApartadoPostal76343,Caracas1070-A(Venezuela).ABSTRACTAcommercialCoMoly-Al203catalystwasactivatedin

3、thetemperaturerange300-800°Caccordingto3differentprocedures:(i)reductionbyH2(R)followedbyreduction-sulfidationbyH2S+H2(RS),(ii)directreductionsulfidationRSand(iii)sulfidationbyH2S(S)followedbyRS.Thesampleswerecharacterizedforcatalyticactivity(hydrogenolysisofthiopheneandhydrogenat

4、ionofcyclohexeneat3MPa)andbyXPS,IRofadsorbedNO,NOchemisorptionandsulfurcontentanalysis.Thecouplingofthereductionandsulfidationprocessesisveryfavorabletosulfidationandactivity.Ifreductionistooeasy,thecouplingeffectweakens,difficultlysulfidableMoo2isformed,andcatalystswithloweractiv

5、itiesareusuallyobtained.ThehighactivityofcatalystsobtainedbyRSataround400°CcanbeexplainedbythepresenceofaCoMoSphase.ThehighactivityofR+RSorRScatalystsobtainedrespectivelyat400°Cand>400°CseemstocorrespondtoaremotecontroleffectinvolvingsegregatedcobaltsulfidesandMoS2(orCoMoS).Thesur

6、prisingconstancyofactivityofRScatalystsactivatedat400

7、estingthatamostimportantcharacteristicofanactivecatalystisaproperbalanceofthenumberofexposedCoandMoions.1.INTRODUCTIONHydrodesulfurization(HDS)catalystscontainingcobalt-molybdenum(CoMo)andnickel-molybdenum(NiMo)areproducedintheoxidicform.Theactivationiscarriedoutunderpressurebyred

8、ucingandsulfidingagents(0.2-5MPa)