共价有机框架材料在多相催化领域的研究进展（英文）

共价有机框架材料在多相催化领域的研究进展（英文）Title:ResearchProgressofCovalentOrganicFrameworksasHeterogeneousCatalystsinMultiphaseCatalysisAbstract:CovalentOrganicFrameworks(COFs)haveemergedasapromisingclassofmaterialswithapredefinedstructure,highporosity,andtunableproperties.Theseuniquefeatureshaveattractedsignificantattentioninthefieldofheterogeneouscatalysis,especiallyinmultiphasecatalyticreactions.Inthisreview,wesummarizetherecentresearchprogressinutilizingCOFsasheterogeneouscatalystsinmultiphasecatalysis.Wehighlightthesynthesisstrategies,structuralcharacterization,andcatalyticperformanceofCOFsacrossvariousmultiphasereactions.Additionally,wediscussthechallengesandfuturedirectionsinthisrapidlyevolvingfield.1.IntroductionHeterogeneouscatalysisplaysacrucialroleinvariousindustrialprocesses,includingpetroleumrefining,chemicalsynthesis,andenvironmentalremediation.Traditionalcatalysts,suchasmetaloxidesandzeolites,havelimitationsintermsofselectivity,stability,andrecyclability.COFs,asaclassofcrystallineporouspolymers,offerpromisingopportunitiestoovercometheselimitations.Theirsynthesiscanbetailoredtoachievespecificstructureandfunctionality,makingthemidealcandidatesforheterogeneouscatalysisapplications.ThisreviewaimstoprovideanoverviewofrecentdevelopmentsintheuseofCOFsasheterogeneouscatalystsinmultiphasecatalysis.2.SynthesisandStructuralCharacterizationofCOFsThesynthesisofCOFsinvolvestheformationofcovalentbondsbetweenorganicbuildingblocks,leadingtotheformationofcrystallineframeworkswithextendedperiodicstructures.Varioussyntheticstrategies,includingcondensationreactionsanddynamiccovalentchemistry,havebeendevelopedtobuildCOFswithdiversestructuresandproperties.ThestructuralcharacterizationofCOFsreliesontechniquessuchasX-raydiffraction,scanningelectronmicroscopy,andsolid-stateNMRspectroscopy.3.COFsasCatalystsinMultiphaseReactionsMultiphasecatalysisinvolvesreactionsbetweenreactantsindifferentphases,typicallyaliquidandagas.COFspossessexcellentthermalandchemicalstability,highsurfacearea,andporeaccessibility,enablingtheirefficientuseascatalystsinmultiphasereactions.SeveralstudieshavereportedtheuseofCOFsinvariousmultiphasecatalyticreactions,includinggas-liquid,liquid-liquid,andliquid-solidreactions.Notably,COFshaveshowngreatpotentialascatalystsforC-CandC-Xbondformation,hydrogenation,oxidation,andotherimportanttransformations.4.CatalyticPerformanceofCOFsThecatalyticperformanceofCOFsdependsonvariousfactors,includingporesize,surfacefunctionality,andstabilityunderreactionconditions.COFscanbemodifiedbyincorporatingmetalnanoparticles,introducingfunctionalgroups,orpost-syntheticmodifications,enhancingtheircatalyticactivityandselectivity.However,challengessuchasmasstransportlimitationsandsubstratediffusionwithintheporousstructureofCOFsneedtobeaddressedtoimprovetheiroverallcatalyticperformance.5.ChallengesandFutureDirectionsDespitethesignificantprogressmadeinthefieldofCOFsasheterogeneouscatalystsinmultiphasecatalysis,severalchallengesremain.Furtherstudiesarerequiredtounderstandthestructure-activityrelationshipsofCOFsandoptimizetheircatalyticperformance.ThedevelopmentofscalablesynthesismethodsandtheexplorationofnewCOFcompositionswillfacilitatetheirpracticalapplications.Inaddition,catalystrecoveryandrecyclingstrategiesneedtobedevelopedtoensuretheeconomicviabilityandsustainabilityofCOFsinindustrialprocesses.6.ConclusionInconclusion,COFshaveemergedasversatilematerialswithgreatpotentialforheterogeneouscatalysisinmultiphasereactions.TheuniquefeaturesofCOFs,includingtheirwell-definedstructures,highporosity,andtunableproperties,makethempromisingcandidatesforvariouscatalyticprocesses.Furtherresearcheffortsarerequiredtoovercomethecurrentchallengesandfullyexploitt