PREPARATION OF POROUS CARBONS FROM PHENOL–FORMALDE.pdf
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PERGAMONCarbon38(2000)817±824Preparationofporouscarbonsfromphenol±formaldehyderesinswithchemicalandphysicalactivationHsishengTeng*,Sheng-ChiWangDepartmentofChemicalEngineering,NationalChengKungUniversity,Tainan70101,TaiwanReceived16April1999;accepted26July1999AbstractPorouscarbonswithhighporositieswerepreparedfromphenol±formaldehyderesinsusingchemicalandphysicalactivationmethods.Theresinprecursoremployedwassynthesizedwithaninitialformaldehyde-to-phenolratioof1.33bymole.ThechemicalactivationprocessconsistedofKOHimpregnationfollowedbycarbonizationinnitrogenat500±9008Cfor0±3h,whereasthephysicalactivationwasperformedbycarbonizingtheresinsat9008CfollowedbygasifyingthecharinCO2todifferentdegreesofburn-off.Bothactivationmethodscanproducecarbonswithsurfaceareasandporevolumesgreaterthan2000m23/gand1.0cm/g,respectively.Thein¯uenceofdifferentparametersduringchemicalactivation,suchascarbonizationtemperatureandtime,KOH/resinratioandheatingrate,onthecarbonyieldandthesurfacecharacteristicswasexplored,andtheoptimumpreparationconditionsweredetermined.Withphysicalactivationtheresultingcarbonsaremainlymicroporousandtheirporosityisanincreasingfunctionofthedegreeofburn-off.Atsimilarporositylevelsthecarbonyieldduringphysicalactivationwasfoundtobelowerthanthatwithchemicalactivation.AnSEMstudyshowedthatcarbonsproducedfromCO2activationhaveamorecompactsurfacethanthoseproducedfromKOHactivation.2000ElsevierScienceLtd.Allrightsreserved.Keywords:Activatedcarbon;B.Activation,Chemicaltreatment;D.Surfaceareas,Porosity1.Introductionspeciescontainedincoalgenerallyrestrictstheporositydevelopmentofthederivedcarbon,sincetheresultingashPorouscarbons,whichhavethecollectivenameofhasanegligibleporositycomparedtomicroporouscarbon.activatedcarbon,havebecomemoreandmoreattractivePhenol±formaldehyderesinshavestructuralfeaturessimi-materialsforuseinmanyadsorptionandcatalyticpro-lartothoseincoals,butcontainmuchfewermineralcessesduetotheirhighadsorptivecapacity[1].Theseimpurities