%0 Journal Article
%T Immobilizationof12-TungstophosphoricAcidonAlSBA-15andItsCatalyticActivityforAcetylation
%A Immobilization of -S. REVATHI
%A M. Esther Leena PREETHI
%A D. MANIKANDAN
%A D. DIVAKAR
%A A. Valentine RUPA
%J ´ß»¯Ñ§±¨
%P 1202-1210
%D 2008
%X £¿12-Tungstophosphoricheteropolyacid(TPA)withaKegginstructurewasintroducedintoAl-incorporatedmesoporousmolecularsieves(AlSBA-15)bytheincipientwetnessmethod.ThematerialswerecharacterizedbyX-raydiffraction,nitrogenadsorption,scanningelectronmicroscopy,UV-VisdiffusereflectanceandRamanspectroscopy,whichconfirmedtheKegginandmesoporestructure.Itscatalyticactivitywasevaluatedundersolvent-freeconditionsintheliquidphaseat333¨C383Kforthepropionylationofanisolewithpropionicanhydride.ThecatalystsusedwereAlSBA-15,10%,20%,and40%TPA/AlSBA-15,and20%TPA/MCM-48.Inthepropionylationofanisolewithpropionicanhydride,thesubstitutionoccurredpredominantlyattheparaposition.The20%TPA/AlSBA-15catalystgaveatotalproductyieldof48%with98%selectivitytowards4-methoxypropiophenone.Theregenerabilityofthecatalystwasalsostudiedandwasfoundtobeexcellent.
%K heteropolyacid
%K mesopore
%K AlSBAª²15
%K anisole
%K propionicanhydride
%K propionylation
%U http://www.chxb.cn/CN/abstract/abstract17347.shtml