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1、SeparationScienceandTechnologyAdsorptionofCO2onZeolite13XandActivatedCarbonwithHigherSurfaceArea*ZhijuanZhang,WeiZhang,XiaoCHEN,QibinXIA,ZhongLi(SchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou,510640,China)*Correspondingauthor.Fax:+86-20-8711
2、0608.E-mailaddress:cezhli@scut.edu.cnAbstract:Inthiswork,adsorptionisothermsandadsorptionkineticsofCO2onzeolite13Xandactivatedcarbonwithhighsurfacearea(AC-h)werestudied.TheadsorptionisothermsandkineticcurvesofCO2ontheadsorbentswereseparatelymeasuredat328K,318K,308Kand298K,andw
3、ithpressurerangeof0-30barbymeansofgravimetricadsorptionmethod.ThemasstransferconstantsandadsorptionactivationenergyEaofCO2ontheadsorbentswereestimatedseparately.ResultsshowedthatatverylowpressuretheamountsadsorbedofCO2onthezeolite13XwashigherthanthatontheAC-h,whileathigherpres
4、sure,theamountsadsorbedofCO2ontheAC-hwashigherthanthatonthezeolite13XsincetheAC-hhaslargersurfaceareaandlargertotalporevolumecomparedtothezeolite13X.TheadsorptionkineticsofCO2canbewelldescribedbythelineardrivingforce(LDF)model.Withtheincreaseoftemperature,themasstransferconsta
5、ntsofCO2adsorptiononbothsamplesincreased.TheadsorptionactivationenergyEaforCO2onthetwoadsorbentsdecreasedwiththeincreaseofpressure.Furthermore,atlowpressuretheEaforCO2adsorptiononthezeolite13XwasslightlylowerthanthatontheAC-h,whileathigherpressuretheEaforCO2adsorptiononthezeol
6、ite13XwashigherthanthatontheAC-h.Keywords:carbondioxideremoval;zeolite13X;highsurfaceareaactivatedcarbon(AC-h);adsorptionisotherms;adsorptionkinetics;activationenergyINTRODUCTIONGloballythereisanincreasingconcernovertheenvironmentalimpactofanthropogenicgasemissions,particularl
7、ycarbondioxide,withtargetsandtaxesbeingimplementedtodecreasegasreleasetotheatmosphere.Overthelastcentury,rapidincreaseinatmosphericCO2concentrationhasresultedin-1-SeparationScienceandTechnologyglobalclimatechangeandevenmoreextremeclimaticconditions(1-4).CO2emissionscontrolcoul
8、dhavesignificantsocial,economicandenvironmentalimpactsontheea
