超临界流体化学沉积法制备金属钯复合膜及其表征

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8、F¨IⅧ¨I⋯ⅢⅢ⋯f㈣l¨lⅢ9Y1531797博士学位论文超临界流体化学沉积法制备金属钯复合膜及其表征FabricationandCharacterizationofPalladiumCompositeMembranesbyChemicalFluidDepositionfromSupercriticalFluids国家自然科学基金(重点项目)资助学科专业：化学工程研究生：刘伟指导教师：张宝泉教授天津大学化工学院二零零八年九月ABSTRACTBecauseoftheirexcellentpermeabi

9、lity,perm-selectivityandchemicalandmennalstabilityaswell弱mechanicalstability,Palladium-basedcompositem鼬braneshaveattractedwideattentioninmembranetechnology．Additionally,aseriesofbi．functionalcatalystscanbeobtainedbydispersingpalladiumnanoparticlesonthesurfaceofcrys

10、talgrainsorintotheboundariesinzeoliteormolecularsievefilms．whichisconstitutedbyanacidmatrixandametallicfunctioninporousenvironments．Thiscallgetproductinasingle—stepprocessinsteadofmulti—processeslittlebyproduct，whichmayplayanimportantroleinindustry．Thepaperdiscusse

11、dtheprincipleandinfluencefactorsofhydrogenpermeatmn,Dreparationmethodsofpalladium．basedmembranesandtheirapplications．BasedonⅡlechar￡屺teristicSofsupercriticalfluidwhichexhibitdensitieslikethoseofaliquidsolventwhileretainingthetransportpropertiesofagas，anovelpreparat

12、iontechniqueundersupercriticalconditionsWaSemphasized．ChemialfluiddepositionfromsupcriticalfluidisanovelapproachtometaldepositionthatinvolvesthechemicalreductionoforganometalliccompoundsinsupercriticaldioxidetodepositPalladiumintotheporesofdifferentsubstrates．Palla

13、diumweredepositedintotheporesorOilthesurfaceofM203substratethrou吐opposingreactantschemicalfluiddeposition(ORCFD)inacontinuousprocesscombinedwithanorganometallicpalladiumastheprecursorwithethanolasthereducingagentwhichmayavoidhydrogenembrittlementandbelessdangerous·

14、Bychangingdiffusiontimeoractivingthesurfaceofsubstrates，PdfilmorPdparticleswerefo锄donthesurfaceorwithinthesubstrates；thecontentsofPalladiumincreasedthroughprolongingreactiontime．Themicrostructurewithintheporousa．aluminasupportisimprovedbyannealing．Astudyofthesurfac

15、eseeding／activationstepwereused．inwhichthesubstratewaspre．seededwithacatalyticallyactivematerialandthendepositedpalladiumfromsupercriticalcarbond