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1、AdvancedReactionEngineering——WaterGasShiftReactioninaMembraneBedReactionDr.IdemDr.LiangDr.PanGroup5Name:SuLiusongNumber:S1411W0694GroupMembers:Cuiding,LiNa2014.11.101.IntroductionThewater-gasshift(WGS)reactionisimportantinthechemicalandpetrochemicalindustryforthep
2、roductionofhydrogenusingsynthesisgasasafeedstock.Asthereactionequationcanbewrotethat:;Therearemanykindsofcatalyststocatalyzetheabove-mentionedreaction.Reactionkineticsisoneofthemostimportantparametersforwater-gasshiftreactionovermanykindsofcatalystssuchasFe-basean
3、dRh-basecatalystsbecauseitindicatesthathowfastCOreactswithwater,anditisoneofthekeyparametersforsimulatinganddesignthereactor.Thekineticsofthewater-gasshiftoverthreenewlydevelopedchromium-freecatalystsFe2O3/ZrO2,Rh/ZrO2andRh/Fe2O3/ZrO2wereinvestigatedinamembranepac
4、kedbedplugflowreactorinthetemperaturerangeof623-773Katatotalpressureof21bar.DifferentkineticmodelsbasedonredoxandassociativeWGSmechanismsdependingonthetypeofcatalystwereevaluatedtorepresentthekineticdata.Inordertoexploretheadvantageofusingthishighlyactivecatalysti
5、naprocess,developmentofakineticmodelisessentialintheindustry.Figure1isamodelofplugflowreactor,wecanconcludethatthecompositionofthefluidvariesfrompointtopointalongaflowpath,asaconsequence,thematerialbalanceforareactioncomponentmustbemadeforadifferentialelementofvol
6、umedV.Thus,asforreactantA,wecanknowthat:Input=output+disappearancebyreaction+accumulation(1)WecanseeforvolumedVthat:InputofAismarkedtobeFA,moles/time;OutputofAismarkedtobeFA+dFA,moles/time;DisappearanceofAbyreactionis(-rA)dV,andintheplugflowreactor,theaccumulation
7、ofthematerialiszero,sowecanobtain:(2)-rAisthedisappearantrateofthereactant,Fromtheequation(2),wecanobtain:Andweknowthat:Sowecanconcludethat:(3)Figure1.modelofplugflowreactorFortheholereactor,thereactionrate(-rA)canbepresentedasbelow:(4)And(5)Wherek0ispre-exponenti
8、alconstantorfrequencyfactor,Eisactivationenergy,TisthetemperaturewiththeunitofK,CAistheconcentrationofspeciesA,andnistheindividualreactionorderofA.Inthe
