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1、Effectofsurfacearea,porevolumeandparticlesizeofP25titaniaonthetransformationofanatasetorutileKJosephAntonyRaj,and&BViswanathan*NationalCentreforCatalysisResearch,IndianInstituteofTechnology-Madras,Chennai600036.eEmail:bvnathan@iitm.ac.inReceived9June2009
2、;AbstractTheeffectofcalcinationonP25atdifferenttemperaturestitaniahasbeenstudiedbyXRD,nitrogenadsorption-desorptionisotherm,BET-surfacearea,porevolume,poresize,particlesizeandcrystallitesizeinordertounderstandtheconversionofanatasetorutile.Thefractionofa
3、nataseandrutilewashasbeendeterminedusingXRD.Althoughthecrystallinityremainsthesame,thephasechangeofanatasetorutilewasisinevitablewithtemperature.Theisothermsessentiallyshowedthenon-porouscharacteristicsoftheP25samples.Inaddition,thenitrogenadsoptionbythe
4、samplesdecreasedappreciablyloweredwithcrystallinity.TheporevolumeandBET-surfaceareashowedaradicallargedecreaseat900oC.Theparticlesize,crystallitesize,andporesizeshowedanincreasingtrendwithincreaseintemperature.TheaAnalysisofthephysicalcharacteristicsindi
5、catedthatP25titaniasamplescanbeusedforcatalyticapplicationsatlessthan500oC.Keywords:Catalysts,Phasetransformations,P25tTitania,Porevolume,Crystallinity,Particlesize,Surfacearea.IPCCode:B01J21/00IntroductionTitaniaisanefficientcatalystinphoto-oxidationofo
6、rganicpollutants1.Thephotocatalyticpropertiesareinfluencedbyphysicochemicalvariablessuchasparticlesize,porevolume,surfacearea,andcrystallinity.Generally,authorsuseLangmuir-Hinshelwoodkineticexpressionstomodelphotocatalyticreactiondata2,3,showingtheimport
7、anceofsubstrateadsorptionandthussurfacearea.StudiesdonotconclusivelysupportthisinterpretationofdependenceofsurfaceareaandphotocatalyticactivitybyTiO24,5.TheparticlesizeoftitaniawasdemonstratedtoInfluenceofparticlesizeoftitaniaonthephotocatalyticactivityh
8、asbeendemonstrated.Riveraetal.6reportedincreasingrateofphotocatalyticdegradationwithanatasecrystallitesize.,whileAnpoetal.7havereportedthatforanataseparticlesintherangeof4–50nm,photocatalyticactivityincreasedwithdecreasing
