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1、J.Chem.Eng.Data2004,49,1095-11011095AdsorptionEquilibriumofMethane,CarbonDioxide,andNitrogenonZeolite13XatHighPressuresSimoneCavenati,CarlosA.Grande,andAlõÂrioE.Rodrigues*LaboratoryofSeparationandReactionEngineering,DepartmentofChemicalEngineering,Facultyof
2、Engineering,UniversityofPorto,RuaDr.RobertoFriass/n,4200-465,Porto,PortugalHigh-pressureadsorptionofmethane,carbondioxide,andnitrogenonzeolite13Xwasmeasuredinthepressurerange(0to5)MPaat(298,308,and323)KandfittedwiththeTothandmultisiteLangmuirmodels.Isosteri
3、cheatsofadsorptionwere(12.8,15.3,and37.2)kJ/molfornitrogen,methane,andcarbondioxiderespectively,whichindicateaverystrongadsorptionofcarbondioxide.ThepreferentialadsorptioncapacityofCO2onzeolite13Xwasmuchhigherthanfortheothergases,indicatingthatzeolite13Xcan
4、beusedformethanepurificationfromnaturalgasorforcarbondioxidesequestrationfromfluegas.Introductionbothmethaneandcarbondioxidestartingfromamixtureofmethaneandcarbondioxidedilutedinnitrogen.AnotherTheuseofnaturalgasasafuelisadvantageousfromimportantexampleisth
5、eMolecularGatetechnology(En-anenvironmentalpointofviewandhasbecomeeconomi-gelhard,USA)forbothCO2andN2removalfromnaturalcallyattractive.Fromthevantageofenvironmentalprotec-5gasstreamsusingproprietaryadsorbents.tion,byuseofnaturalgasasavehicularfuel,reduction
6、sOnceaselectiveadsorbentforcarbondioxideisfound,inCO,CO2,andSO2are(97,24,and90)%,respectively,analternativeapplicationiscarbondioxidesequestrationandtheamountofleaddischargedinexhaustgasesisfromfluegas.Inthisway,manyworkshaveusedzeolitereducedtozero,andalso
7、itischeaperthangasolineor13XtorecovercarbondioxidefromabinarymixtureofCO2diesel.9+N2.Todesignapressure-swingadsorption(PSA)Currently,naturalgassuppliesone-fourthoftheenergyprocess,thebasicinformationrequiredistheadsorptionneededintheworld'shomes,businesses,
8、vehicles,indus-equilibriumbehaviorofthepurecomponents.Inthiswork,tries,andpowerplants,andtheconsumptionofnaturalwehavegravimetricallymeasuredhigh-pressureadsorp-gasisexpectedtogrowby50%overthenext20yea
