studies of the methane steam reforming reaction at high pressure in a ceramic membrane reactor

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1、StudiesoftheMethaneSteamReformingReactionatHighPressureinaCeramicMembraneReactorJournalofNaturalGasChemistr~www.elsevier.com/locate/jngcAvailableonlineatwww.sciencedirect.com8c…@.…cT.JournalofNaturalGasChemistry15(2006)73—81ArticleSCIENCEPRESSStudiesoftheMethaneSteam

2、ReformingReactionatHighPressureinaCeramicMembraneReactorP.Hacarlioglu,Y.Gu,S.T.OyamaEnvironmentalCatalysisandNanomaterialsLaboratory,DepartmentolChemicalEngineering(o211),VirginiaPolytechnicInstitute&StateUniversity,Blacksburg,Virginia24061fManuscriptreceivedApri

3、l11,2006]Abstract:TheeffectsoftemperatureandpressureonthesteamreformingofmethanefCH4+H2O{=3H2+CO)wereinvestigatedinamembranereactor(MR)withahydrogenpermeablemembrane.Thestudiesusedanovelsilica-basedmembranepreparedbyusingthechemicalvapordepositionfCVD1tech-niquewitha

4、permeanceforH2of6.0x10—mol?m一.s一.Pa～at923K.Theresultsinapacked—bedreactor(PBR)werecomparedtothoseofthemembranereactoratvarioustemperaturesf773—923K)andpressures(1-20atm,i01.3—2026.5kPa)usingacommercialNi/MgA1204catalyst.Theconversionofmethanewasimprovedsignificantlyi

5、ntheMRbythecountercurrentremova1ofhydrogenatalltern—peraturesandallowedproductyieldshigherthantheequilibriumtobeobtained.Pressurehadapositiveeffectonthehydrogenyieldbecauseoftheincreaseindrivingforceforthepermeanceofhydrogen.Theyieldofhydrogenincreasedwithpressureand

6、reachedavalueof73x10—0mo1.g一.s一at2026.5kPaand923Kwhichwashigherby108%thanthevalueof35x10—0mo1.g一.s一obtainedfortheequilibriumyield.Theresultsobtainedwiththesilica-basedmembraneweresimilartothoseobtainedwithvariousothermembranesasreportedintheliterature.Keywords:steamr

7、eformingofmethane;silica-basedmembrane;membranereactor;hydrogen1.IntroductionHydrogenisenvisionedtobeoneofthedomi—nantenergycarriersofasustainableenergysupplysystemofthefuture.Atpresent,naturalgasisoneofthemostviablesourcesforhydrogenproductionbecauseofitsabundantsup

8、plyanditsrelativelylowcost.Thesteamreformingprocessiscurrentlyusedcommerciallytoproducehydrogenandsynthesisgas(amixtureofH2andCO)fr