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在线光电离质谱研究Li2CO3对松木热解的影响.docx

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在线光电离质谱研究Li2CO3对松木热解的影响 Title:InvestigationoftheEffectsofLi2CO3onthePyrolysisofPineWoodUsingOnlinePhotoionizationMassSpectrometry Abstract: Pyrolysisisakeyprocessinthethermaldecompositionofbiomass,andunderstandingtheinfluentialfactorsiscrucialforoptimizingtheconversionofbiomassintovaluableproducts.ThisstudyaimstoexploretheeffectsofLi2CO3onthepyrolysisofpinewoodusingonlinephotoionizationmassspectrometry(PIMS)asapowerfulanalyticaltool.TheresultsprovidevaluableinsightsintotheroleofLi2CO3inenhancingthepyrolysisprocessandimprovingtheproductdistribution. Introduction: Pyrolysisisathermochemicalprocessinwhichbiomassisconvertedintovariousvaluableproductssuchasbiofuels,biochemicals,andactivatedcarbon.Theoptimizationofpyrolysisconditionsandtheadditionofcatalystshavegainedsignificantinterestinrecentyears.Lithiumcarbonate(Li2CO3)hasshownpromisingresultsasacatalystforenhancingthepyrolysisprocess.ThisstudyaimstoinvestigatetheeffectsofLi2CO3onthepyrolysisofpinewoodandelucidatethemechanismbehinditscatalyticbehavior. ExperimentalMethodology: Theexperimentwasconductedusingatubularfurnacecoupledwithonlinephotoionizationmassspectrometry(PIMS).PinewoodsampleswereimpregnatedwithvaryingconcentrationsofLi2CO3andpyrolyzedundercontrolledconditions.TheevolvedgaseswereanalyzedusingtheonlinePIMSinstrument,whichprovidesreal-timeinformationonthegas-phasespeciesgeneratedduringthepyrolysisprocess. ResultsandDiscussion: TheadditionofLi2CO3tothepinewoodsamplessignificantlyinfluencedthepyrolysisprocess.TheonlinePIMSmeasurementsrevealedchangesinthegas-phasespeciesandtheirrelativeabundances.ThepresenceofLi2CO3increasedtheproductionofvolatileorganiccompounds(VOCs)suchasmethane,ethane,andethyleneduringpyrolysis.ThisenhancementinVOCproductionsuggeststhatLi2CO3actsasacatalyst,promotingthefragmentationanddecompositionofthebiomassintosmaller,morereactivespecies. Furthermore,thedetectionofvariousaromaticcompounds,suchasbenzeneandtoluene,indicatedtheoccurrenceofsecondaryreactionsduringpyrolysis.Li2CO3mayfacilit