Effects of preparation conditions in hydrothermal synthesis of highly active.pdf

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1、AppliedCatalysisA:General363(2009)45–51ContentslistsavailableatScienceDirectAppliedCatalysisA:Generaljournalhomepage:www.elsevier.com/locate/apcataUnsupportedNi-Mo-WsulphideHDScatalystswiththevaryingnickelconcentrationa,*,R.Huirache-Acun˜abccdJ.Bocarando,W.Bensch,

2、Z.-D.Huang,V.Petranovskii,ddS.Fuentes,G.Alonso-Nu´n˜ezaDepartamentodeQuı´mica,CentrodeInvestigacio´nenMaterialesAvanzados,S.C.C.P.31109,Chihuahua,MexicobCentrodeFı´sicaAplicadayTecnologı´aAvanzada-UNAM,BoulevardJuriquilla3001,JuriquillaQuere´taro,76230,MexicocInst

3、itutfu¨rAnorganischeChemie,UniversityofKiel,Olshausenstraße40-60,24098Kiel,GermanydCentrodeNanocienciasyNanotecnologı´a,UniversidadNacionalAuto´nomadeMe´xico,Ensenada,B.C.,MexicoARTICLEINFOABSTRACTArticlehistory:UnsupportedNi-Mo-Wsulphidehydrodesulphurization(HDS)

4、catalystswerepreparedbyex-situReceived5December2008decompositionoftrimetallicNi-Mo-Wprecursorsvaryingthenickelconcentration.Firstly,theReceivedinrevisedform15April2009trimetallicprecursorsweretreatedinastainlesssteelvesselof45mLvolumeat523Kfor2hunderAccepted18Apri

5、l2009argonatmosphere.Subsequently,therespectivethiosaltwasdecomposedunderareductiveatmosphereAvailableonline24April2009ofH2S/H2(15vol.%H2S)fromroomtemperatureto673K.AseriesoffourcatalystswastestedinHDSofdibenzothiophene(DBT).ThecatalystswerelabeledasNi0.5,Ni1andNi

6、2accordingwiththemolarratioKeywords:ofNiinthesample.Inaddition,aprecursorwithamolarratioNi-Mo-Wof2:1:2waspreparedvaryingTrimetallicNi-Mo-Wtheconcentrationoftungsten,namedasW2.ThecatalystswerecharacterizedbyscanningelectronEx-situactivationmicroscopy(SEM),energydis

7、persivespectroscopy(EDS),highresolutiontransmissionelectronHydrodesulphurizationmicroscopy(HRTEM),X-raydiffraction(XRD)andBETspecificsurfaceareameasurements.Theex-situactivationmethodleadstocatalystswithadistributionofspecificsurfaceareasfrom8to234m/g,showingtypeIVa

8、dsorption–desorptionisothermsofnitrogentypicalformesoporousmaterials,andpoorlycrystallinestructureswithdifferentmorphology,andvaryingphasecomposition.Th