Adsorption of xylene isomers on ordered hexagonal mesoporous

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1、Adsorption(2009)15:123132DOI10.1007/s10450-009-9159-8AdsorptionofxyleneisomersonorderedhexagonalmesoporousFDU-15polymerandcarbonmaterialsZhangxiongWu·YunxiaYang·BoTu·PaulA.Webley·DongyuanZhaoPublishedonline:20March2009©SpringerScience+BusinessMedia,LLC2009AbstractTheoilindu

2、stryhasbeenfacingthechallengesdicatingthefeasibilityofusingthethreeisomersasadsor-ofseparationofxyleneisomers,o-xylene,m-xyleneandbatestoextractporeinformation.p-xyleneorremovingthemfromtheenvironment.Inourpresentwork,weinvestigatedtheadsorptionofthethreeiso-KeywordsMesopor

3、ousmaterials·FDU-15·Adsorption·mersontwomesoporousmaterials,FDU-15-350polymerXylene·CarbonandFDU-15-900carbonmaterials.Theisomeradsorptioncapacitiesarewellcorrelatedwiththeirphysicalporeprop-1Introductionerties.Itisfoundthatthemicroporesareverycrucialfortheadsorptionofthese

4、threeisomers.ThemoremicroporeXyleneasaveryimportantorganichydrocarbonisnormallyvolumetheadsorbenthas,thebettertheadsorptioncapac-composedofthreeisomercomponents:o-xylene,p-xylene,ityis.Henrysconstantswerealsocalculatedforthethreeandm-xylene.Theextremedifficultyinseparatingth

5、eseiso-isomersonthetwoadsorbents.BothonFDU-15-350poly-mershasleadtooneofthemostchallengingissuesintheoilmerandFDU-15-900,theHenrysconstantsforthethreeindustrybecausedistillationisonlyfeasibleforremovingo-xylenebutfailsintheothertwoisomersbecauseofisomersshowthesametrendo>m>

6、pxylenewhichisthesimilarityoftheirboilingpoints(p-xylene:138◦C,coincidentlyinaccordancewiththeirpolaritytrend,indicat-m-xylene:138139◦C)(Meyers2003).Meanwhile,theseingmorepolaradsorbateispreferredforadsorptionontheisomersareverytoxicvolatileorganiccompounds(VOCs)twoadsorben

7、ts.Theisostericheatsofadsorptionarecorre-andfailureinseparatingthemfromtheindustrialemis-latedwiththemicroporosityandthesizeoftheadsorbatesionsresultsinthedischargeofthemixtureintotheairmolecule.Moremicroporosityandsmallermoleculesgivethreateningtheenvironment.Adsorptionisa

8、widelyadoptedhigherheatsofadsorption.Extractedinformationonporeapproachtoseparatex