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1、readingrepresentationCATALYSTcatalyst'sconsiderationactivity,selectivity,efficiencyseperationofproduct,reactantandcatalystmechanicalbehaviourenvironmentalperformancefeatureofacatalystclassificationhomogeneouscatalystheterogeneouscatalysthomogeneouscatalystadvantage:highactivityandselectivi
2、ty-promotereactionfrommolecularsizedrawback:diffculttorecyclecatalystandseperateproduct-catalyst,productandreagentallinonephasehomogeneouscatalysteg.metal-organiccomplex,salthetergeneouscatalystadvantage:easytoseperate-catalyst,productandreagentindifferentphasesdrawback:lowactivityandselec
3、tivity-promotereactionmainlyfromphaseinterfacehetergeneouscatalysteg.metal,metaloxidehowtocombineadvantages1.distributecatalyst,productsandreagentsintodifferentphases-L-L,L-L-Ssystemsandsoon2.immobilizationofhomogeneouscatalyst-findapropercatalystsupport3.supportedliquid-phasecatalyst-find
4、asupportandaliquidfilmback-mixingengineeringfactorsback-mixingisbeneficialtoreactionsystemback-mixingisunfavorabletoreactionsystemback-mixingisalwayscausedbystirringwhichproducesashearingforcefieldback-mixingisneededtoL-Lsystemshearingforcefieldmaybreakliquidintodroplet,increasestwophase's
5、contactingareatoSL-PCusefulshearingforcefieldwilldestroyliquidfilm'sstabilityharmfulashearingforceexistsback-mixingisneedlesstoL-Lsystemtwophase'scontactingareawillbeverylimitedtoSL-PCharmfulliquidfilm'sstabilitywillelevateandcatalystcouldbeusedinaPFRusefulashearingforcedisappearsSL-PC'sst
6、ructuresupport(inertia,specificsurface,aperture)liquidfilm(moistening,non-volatile,solubility,stability)activeconstituent(dependonreaction)preparationofSL-PCscoutforproperstuffeg.Renay-nickel,Al2O3,controlledporeglass,polystyreneeg.highboilingpointorganicsolvent,water,moltensaltL-Lsystemli
7、quid1liquid2preparationofL-Lscoutforproperliquidgoodsolventforreagentsandproduct,oronlyoneofthemgoodsolventforonlycatalystfeaturesincommen:environmental,non-volatile,economic,selectivityandsoonagoodcatalysthighactivity,selectivity,efficiencyeasyseperationofpro
