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A型分子筛对THF和甲烷水合物生成及分解过程的影响.docx

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A型分子筛对THF和甲烷水合物生成及分解过程的影响 Abstract TheimpactofA-typezeolitesontheformationanddecompositionprocessesoftetrahydrofuran(THF)andmethanehydrateshasbeenstudied.TheadsorptionpropertiesofA-typezeolitesweredetermined,andtheeffectofzeolitecrystallinityontheformationofTHFandmethanehydrateswasanalyzed.ResultsshowedthatthepresenceofA-typezeolitessignificantlyinfluencestheformationanddecompositionkineticsofTHFandmethanehydrates,andthedegreeofcrystallinityisamajorfactorindeterminingtheadsorptionbehaviorofthezeolites. Introduction Methanehydratesarenaturalgasresourcesthatarepresentinlargequantitiesundertheseafloor,permafrost,andothergeologicalformations.Theyareconsideredaspotentialsourcesofenergyforfutureuse.Theformationofthesehydratesisinfluencedbyseveralfactors,includingtemperature,pressure,andthepresenceofothermolecules,suchasTHF.ThepresenceofTHFinthehydrateformationprocessisknowntoincreasetheefficiencyoftheprocess,andtheuseofzeolitesasadsorbentshasgainedconsiderableattentioninrecentyears.A-typezeolitesareknownfortheirhighcrystallinityandexcellentadsorptionproperties,andhence,theycouldplayanimportantroleintheformationanddecompositionprocessesofTHFandmethanehydrates. Methodology A-typezeolitesweresynthesizedbyahydrothermalmethodandcharacterizedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),andnitrogenphysisorption.Theadsorptionbehaviorofthezeoliteswasstudiedbyusingavolumetricgasadsorptionanalyzer.TheformationanddecompositionofTHFandmethanehydrateswerestudiedbyusingahigh-pressurereactor.Theeffectoftemperature,pressure,andthepresenceofA-typezeolitesontheformationkineticsandstabilityofhydrateswereanalyzed. Results TheXRDandTEManalysesshowedthatthesynthesizedA-typezeoliteshadahighdegreeofcrystallinityandauniformparticlesizedistribution.Thenitrogenphysisorptionanalysisshowedthattheyhadahighsurfaceareaandporevolume.TheadsorptionanalysisshowedthattheA-typezeoliteshadahighadsorptioncapacityformethane,THF,andothergases.Theformationanddecompositionexperimentsshowedthatthepr