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1、MaterialsChemistryandPhysics104(2007)5661Synthesisofthermo-stablehighsurfaceareaaluminapowderfromsolgelderivedboehmiteSeung-MoonKim,Yun-JoLee,Ki-WonJun∗,Jo-YongPark,H.S.PotdarMicro-ChemicalTechnologyLab.,KoreaResearchInstituteofChemicalTechnology,P.O.Box1
2、07,Yuseong,Daejeon305-600,RepublicofKoreaReceived13June2006;receivedinrevisedform24November2006;accepted19February2007AbstractAsimplesolgelroutewasemployedtogeneratehighsurfaceareaboehmiteusingaluminumiso-propoxide(AIP),aceticacid(AA)and2-propanol(IPA)asp
3、recursors.Duringhydrolysismolarratios,i.e.H2O/AIP∼4.0,IPA/AIP∼19andAA/AIP∼0.02werekepttogetfibrousboehmiteprecursorwithhighsurfacearea∼442.9m2g−1bydigestionofprecipitateat80◦Cfor20h.Theboehmiteprecursor,aftercalcinationat1100◦Cfor5h,wastransformedintometas
4、tablephasesofaluminawithsurfaceareaof68.7m2g−1andporevolumeof0.62cm3g−1andaverageporediameterof34.7nmwhileacommonlyusedcommercialone(CATAPAL-A)wastransformedintoonly-aluminaphasehavinglowersurfaceareaof9.1m2g−1andporevolumeof0.10cm3g−1withaverageporediam
5、eterof44.6nm.Theretentionofhighsurfaceareainsolgelderivedaluminapowder(ascomparedtothatderivedfromthecommercialCATAPAL-Aboehmiteprecursor)isattributabletotypicalmorphologicalfeaturesofasderivedboehmite,i.e.fibrillarnature(confirmedbyTEM)thatareresponsiblein
6、retardingsinteringkineticsbecauseoflessnumberofcontactpointsbetweentheparticlesduringcalcination.©2007ElsevierB.V.Allrightsreserved.Keywords:Solgel;Microstructure;Boehmite;-Alumina;-Alumina;BETsurfacearea1.Introductionsynthesisprotocols[811]havebeentrie
7、dtocontrolmorphol-ogyaswellasporosityoftheresultingboehmitepowdersandMetastableformsofaluminumoxidecalledtransitionalu-hencemaintainthehighsurfaceareaandporosityofresult-minaareusedasadsorbents,coatings,softabrasives[1,2]asingtransitionaluminapowders.Inth
8、epresentinvestigation,catalystorcatalystsupportmaterial[3]astheypossessuniqueanattemptismadetosynthesizefibrousboehmiteprecursorpropertieslikehighsurfacearea,porosityandchemicalactivity.bysimplesolgelprocessingusinga
