Methane adsorption behavior on coal having different pore structures--pore structure.pdf

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1、InternationalJournalofMiningScienceandTechnology22(2012)757–761ContentslistsavailableatSciVerseScienceDirectInternationalJournalofMiningScienceandTechnologyjournalhomepage:www.elsevier.com/locate/ijmstMethaneadsorptionbehavioroncoalhavingdifferentporestructuresZhaoYi,JiangChengfa

2、⇑,ChuWeiDepartmentofChemicalEngineering,SichuanUniversity,Chengdu6100065,ChinaarticleinfoabstractArticlehistory:Theadsorptionofmethaneontofivedrycoalsampleswasmeasuredat298KoverthepressurerangeReceived18March2012from0to3.5MPausingavolumetricmethod.TheisothermdatawerefittedtotheLang

3、muirandtheFre-Receivedinrevisedform14April2012undlichequations.Thekineticdatawerefittedtoapseudosecondorderequation,thelineardrivingforceAccepted15May2012equation(LDF),andanintra-particlediffusionmodel.Theseresultsshowedthathighermethaneadsorp-Availableonline25December2012tionisco

4、rrelatedwithlargermicro-porevolumesandspecificsurfaceareas.Theadsorptionwasrelatedtothenarrowmicro-poresizedistributionwhentheprevioustwoparametersarelarge.ThekineticsKeywords:studyshowedthatthekineticsofmethaneadsorptionontothesefivedrycoalsamplesfollowedapseudoPorestructuresecond

5、ordermodelverywell.Methaneadsorptionratesarecontrolledbyintra-particlediffusion.TheMethaneadsorptionAdsorptionkineticsfastertheintra-particlediffusion,thefasterthemethaneadsorptionratewillbe.ModelfittingÓ2012PublishedbyElsevierB.V.onbehalfofChinaUniversityofMining&Technology.1.Int

6、roduction2.ProceduresCoalisacomplexpolymericmaterialwithacomplicatedporous2.1.Experimentalstructure[1].Itisgenerallybelievedthatcoalcontainsbothmicro-andmacro-pores[2,3].Micro-poresarepresentwithinthecoalTheporousstructureoffivecoalsampleswasexaminedusingamatrixandthemacroscopicpo

7、resystemconsistsofthecoalmatrixNOVA1000einstrumentavailablefromQuantachromeCompany.itself.Thisiscalledthenaturalfracturenetworkofthecleatsys-TheN2adsorptiondatawereobtainedatasampletemperaturetem.Thecharacteristicsofmethaneadsorptiononcoalaffectcoalof77Kafterdegassingat393Kfor14h

8、.Thespecificsurfaceareaseamgasmigrationan