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1、JournalofMolecularCatalysisA:Chemical1512000185±192.www.elsevier.comrlocatermolcataMgrAlhydrotalcites:preparation,characterisationandketonisationofaceticacid)KulamaniParida,JasobantaDasRegionalResearchLaboratory,Bhubaneswar751013,Orissa,IndiaReceived28Oct
2、ober1998;receivedinrevisedform14May1999;accepted14May1999AbstractMgrAlhydrotalciteswithdifferentMg:AlratioswerepreparedandcharacterizedbyPXRD,FTIR,TGrDTA,basicsitesandnitrogenadsorption±desorptionmethods.ItisconfirmedfromPXRDthatthematerialshavehydrotalcit
3、estructure.ThebasicsitesofthesamplesweredeterminedspectrophotometricallybyirreversibleadsorptionofacidshavingdifferentpKavalueswhichshowedthatthebasicsitesincreaseswithincreaseinMg:Alratio.Thespecificsurfaceareaofallsamplesliesintherange170±231m2rg.Allthes
4、ampleswerepredominantlymesoporousinnatureandporediameterslieintherange40±70A.ThesamplewithMg:Alratioof4:1showedhighestspecificsurfaceareaandconversionÊ.)86.5%ofaceticacidtoacetonewithhighselectivityat3508C.q2000ElsevierScienceB.V.Allrightsreserved.Keyword
5、s:Hydrotalcite;Characterisation;Ketonisation;Aceticacid;Yield1.IntroductionMIIIaredivalentandtrivalentcationssuchas.2q2q2q2q2q2qMg,Mn,Co,Ni,Cu,ZnandAnionicclays,particularlyhydrotalcites,areAl3q,Fe3q,Cr3q,respectively,Anyistheinterclassoflayeredmaterialso
6、fcurrentinterest.layeranionsuchasCly,NOy,CO2yorany33Hydrotalciteshavebrucite-likepositivelyothermacrocyclicmultivalentanions,etc.,andchargedlayerofmagnesiumandaluminiumxs0.1±0.331,2.Thermaldecompositionofwxhydroxideoctahedrasharingedgestoforminfi-thesemate
7、rialsat4508Cresultsintheformationnitesheetsstackedontopofeachotherandareofhighsurfacearea,basicmixedmetaloxidesheldtogetherbyhydrogenbonding.DuetoduetotheremovalofsurfacialandphysisorbedisomorphoussubstitutionofmetalIIIions,the.water,andcarbondioxidemolec
8、uleswhicharepositivechargethusgeneratedonthebrucitefoundtobepromisingcatalystforbasecat-sheetiscompensatedbytheanionspresentinalyzedreactions.Theactivityandselectivityoftheinterlayerregion.Theyarerepresentedt
