Characterization and catalytic evaluation of aluminum oxides obtained by the atrane route.pdf

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1、GModelCATTOD-6877;No.ofPages7ARTICLEINPRESSCatalysisTodayxxx(2010)xxx–xxxContentslistsavailableatScienceDirectCatalysisTodayjournalhomepage:www.elsevier.com/locate/cattodCharacterizationandcatalyticevaluationofaluminumoxidesobtainedbytheatranerouteGustavoGarcíab,MarisaFalcoa,PedroCrespob,Sa

2、úlCabrerab,UlisesSedrana,∗aInstitutodeInvestigacionesenCatálisisyPetroquímicaINCAPE(FIQ,UNL-CONICET),SantiagodelEstero2654,3000SantaFe,ArgentinabLaboratoriodeSólidosyQuímicaTeórica,InstitutodeInvestigacionesQuímicas(I.I.Q.),UniversidadMayordeSanAndrés,CampusUniversitario,CotaCotaCalleN◦27,L

3、aPaz,BoliviaarticleinfoabstractArticlehistory:Theatraneroute(aluminumtri-secbutoxideasthemetalsourcemixedwithtri-ethanolaminetoyieldAvailableonlinexxxthealumatranecomplex)wasusedtosynthesizealuminasthatshowedspecificsurfaceareasinthe150–275m2/grangeandaverageporesizesinthe60–180Arangeafterca

4、lcination.Differenttechniques˚Keywords:wereusedtocharacterizethealuminas(IR,XRD,27AlMAS-NMR,Nadsorption).Theamountoforganic2Aluminamattertrappedintheinorganicmatrixintheuncalcinedmaterialsdecreasedasafunctionoftheincreas-Atraneingmolarrelationshipbetweenwaterandtheatranecomplexinthesynthesi

5、s,whichrangedfrom9Catalyticcrackingto78.Crystallinemicrodomainsofthe-AlOOHboehmite-typewereformedintheuncalcinedsam-plesthatincreasedtheirsizeasafunctionoftheproportionofwaterinthesynthesis,becausewaterfavorsthehydrolysisandcondensationoftheAl[N(CH2–CH2–O)3]2H3complex.Thecalcinationtreat-m

6、entinducedthecrystallinerestructurationfromboehmite-typeto-alumina-typestructures.Thus,thecalcinedmesoporousaluminasshowedanamorphousstructure,withcrystalmicrodomainsof-alumina-typethatalsoincreasedtheirsizeasafunctionoftheamountofwaterinthestartingmixtures.Ascomparedtothepropertiesofasam

7、plepreparedbytheconventionalsol–gelmethod,themoderatehydrothermaltreatmentintheatranesynthesisroutefavoredthereleaseoftrappedorganicmatterandtheformationofinitialboehmite-typemicrodomains;specificsurfaceareasweresimilar,buttheporesizedistributionswereshar