硅铝比对ZSM-5分子筛膜晶体形貌及其脱硫性能的影响  

Effects of silica-alumina mole ratio of ZSM-5 zeolite membranes on crystal morphology and desulfurization

作　　者：陈玉丽[1] 赵露君 居沈贵[1] 

机构地区：[1]南京工业大学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2016年第6期14-19,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(21176118)

摘　　要：采用二次水热合成法合成ZSM-5分子筛膜,并用Co^(2+)进行改性。考察合成液中SiO_2与Al_2O_3摩尔比(硅铝比,25~250)对ZSM-5分子筛膜晶体形貌的影响。分别采用X线衍射仪(XRD)和扫描电子显微镜(SEM)对不同硅铝比的ZSM-5分子筛膜进行表征,以噻吩(TP)、苯并噻吩(BT)的模拟汽油测试分子筛膜的脱硫效果。结果表明:随着硅铝比的增大,ZSM-5分子筛膜的颗粒形貌逐渐规整,致密度及完整性越好;但硅铝比较大时,膜颗粒形貌不固定,较致密的分子筛膜无法进行脱硫实验。在硅铝比为100时,ZSM-5分子筛膜颗粒形状趋于规整,晶粒比较均匀,晶粒间互锁生长良好且对噻吩的脱硫率达到45%;TP-BT双组分硫化物脱硫率高于单组分;Co^(2+)改性后的ZSM-5分子筛膜脱除噻吩的效果优于未改性的分子筛膜,脱硫率达到62%。Supported ZSM-5 zeolite membranes were obtained by twice hydrothermal synthesis. ZSM-5 zeolite membranes were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM） to uncover the crystal morphology with silica-alumina mole ratios from 25 to 250. Desulfurization experiments were carried out with model gasoline of thiophene （TP） and bicomponent （BT） components. With the increase of silica-alumina male ratio of the membrane, membrane particle shape gradually became regular, but an overly high silica-alumina male ratio could make membrane particle shape irregular.When the silica-alumina male ratio was about 100, it appeared to be unique. SEM results proved the membrane was continuous and complete without observable defects. TP removal was 45%.The removal of TP-BT bieomponent sulfides was better than the the removal of TP in single component model gasoline. Co2＋ modified membrane increased the removal of TP for the desulfurization rate of 62%.

关 键 词：硅铝比 ZSM-5分子筛膜 脱硫 噻吩 

分 类 号：TQ028.8[化学工程]