第37卷第1期高校化学工程学报No.1Vol.372023年2月JournalofChemicalEngineeringofChineseUniversitiesFeb.2023文章编号：1003-9015(2023)01-0045-08TiO2/Al2O3复合载体的气体传质模拟与结构优化金响,付加利,吕庆洋,高雪超,顾学红(南京工业大学化工学院,材料化学工程国家重点实验室,江苏南京211816)摘要：为优化TiO2/Al2O3复合载体结构用于高通量全硅Deca-Dodecasil3R(DD3R)分子筛膜的制备，构建基于黏性流和克努森扩散的气体传质模型，并结合实验获得模型所需参数，探讨了操作条件与结构参数对复合载体内气体渗透的影响。结果表明：单组分气体流率的模型计算值与实验值吻合较好，验证了模型的可靠性；增加压力或降低温度均会减少克努森扩散对气体渗透的影响；CO2通过复合载体的多层非对称结构时，传质阻力主要集中在TiO2层与海绵层。在DD3R分子筛膜已有工作的基础上，通过建立载体与分子筛膜CO2渗透性之比的等值线图，揭示了TiO2/Al2O3复合载体渗透性与TiO2层、海绵层结构参数(孔径和层厚)间的协同关系。关键词：TiO2/Al2O3复合载体；传质模型；数值计算；结构优化中图分类号：TQ021.4文献标志码：ADOI：10.3969/j.issn.1003-9015.2023.01.006GasmasstransfersimulationandstructureoptimizationofTiO2/Al2O3compositesupportJINXiang,FUJia-li,LYUQing-yang,GAOXue-chao,GUXue-hong(StateKeyLaboratoryofMaterials-OrientedChemicalEngineering,CollegeofChemicalEngineering,NanjingTechUniversity,Nanjing211816,China)Abstract:InordertooptimizethestructureofTiO2/Al2O3compositesupportforthepreparationofhighfluxall-silicaDeca-Dodecasil3R(DD3R)zeolitemembrane,agasmasstransfermodelbasedonviscousflowandKnudsendiffusionwasestablished,andtherequiredparametersofthemodelwereobtainedthroughexperiments.Theeffectsofoperatingconditionsandstructuralparametersongaspenetrationinthecompositesupportweresystematicallyexamined.Thecalculatedresultsofsingle-componentgasflowrateshowremarkableagreementwiththeexperimentsandthemodelreliabilitywasverified.ThesimulationresultsindicatethatincreasingpressureordecreasingtemperaturecouldinhibittheinfluenceofKnudsendiffusioningaspermeation.Furthermore,themasstransferresistanceismainlyconcentratedintheTiO2layerandsponge-likelayerwhenCO2permeatesthroughthe...
