Competitive-adsorption-and-selectivity-of

Competitiveadsorptionandselectivityofbenzeneandwatervaporonthemicroporousmetalorganicframeworks(HKUST-1)ZhenxiaZhaoa,⇑,ShaWangb,YanYangb,XuemeiLib,JingLib,ZhongLib,⇑aSchoolofChemistryandChemicalEngineering,KeyLaboratoryofPetrochemicalResourceProcessingandProcessIntensificationTechnology,GuangxiUniversity,Nanning530004,PRChinabSchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,PRChinahighlights�HKUST-1hasmuchhighercapacityforbenzenethanMIL-101below12mbar.�TheisostericheatofbenzeneismuchhigherthanwaterontheHKUST-1.�AdsorptionselectivityofHKUST-1forC6H6/H2Oisupto8.3at318Kand1.0mbar.�Diffusionrateofbenzeneis�17timesfasterthanthatofwatervaporinHKUST-1.graphicalabstractCompetitiveadsorptionandselectivityofbenzeneandwatervaporonthemicroporousmetalorganicframeworks(HKUST-1).articleinfoArticlehistory:Received13June2014Receivedinrevisedform3August2014Accepted4August2014Availableonline11August2014Keywords:CompetitiveadsorptionandselectivityBenzeneandwaterIsostericheatActivationenergyofdesorptionIASTabstractCompetitiveadsorptionandselectivityofbenzeneandwatervaporwerestudiedonthemicroporousmetalorganicframeworks(HKUST-1).TheadsorptionequilibriumandkineticsofpurecomponentaswellasbinarymixturesofbenzeneandwatervaporweresystematicallyinvestigatedontheHKUST-1.TheirbinaryadsorptionselectivityandpermeationselectivityarepredictedviatheIASTmethod.ResultsshowedthattheequilibriumdataofbenzeneandwatervapordepictedtheLangmuir–FreundlichandDualSiteLangmuir–Freundlich(DSLF)typeadsorptionisotherms,respectively.Benzeneexhibitedmuchhigherisostericheatanddesorptionactivationenergythanwatervapor,indicatingastrongerinteractionwiththeHKUST-1.Theadsorptionselectivityofbenzene/waterontheHKUST-1wasofabout�8.32at318Kand1.0mbar,anditsdiffusivityselectivitywasabout17.6at298Kand1.5mbar,respectively.Breakthroughcurvesofbenzeneshowedaremainingcapacityofabout94.7%and72.9%inthepresenceof13and34RH%.Thus,theHKUST-1ismoreselectiveorpreferentialadsorptionforbenzenemoleculesin