气相二氧化硅为硅源合成MFI型分子筛晶体和取向膜  

Synthesis of MFI-type zeolite crystals and oriented films using fumed silica as silica source

作　　者：徐瑞兰[1] 彭勇[1] 江新德[1] 金本清[1] XU Ruilan;PENG Yong;JIANG Xinde;JIN Benqing(School of Sciences,Nanchang Institute of Technology,Nanchang 330099,China)

机构地区：[1]南昌工程学院理学院,江西南昌330099

出　　处：《南昌工程学院学报》2018年第4期48-52,共5页Journal of Nanchang Institute of Technology

基　　金：江西省教育厅科学技术研究项目(GJJ161128;GJJ151112);江西省自然科学基金资助项目(20161BAB213061;20161BAB213062);国家自然科学基金资助项目(201506088)

摘　　要：在中性合成条件下制备MFI型分子筛晶体和膜层,是当前的研究热点。在中性条件下,考察了不同亲疏水性和比表面积的气相二氧化硅作为硅源对MFI晶体二次生长的影响,绘制了晶种的晶化曲线。结果表明,以比表面积为100 m2/g的亲水性气相二氧化硅为硅源时,MFI分子筛晶种的生长速度较快,合成得到的MFI分子筛膜连续、致密,具有高度的b轴取向。Presently,preparing MFI zeolite crystals and films under neutral synthesis condition has already become the research focus.With the usage of fumed silica particle as silica source,the effect of the hydrophilic-hydrophobic property and specific surface area on the secondary growth of seed crystals in the neutral condition was investigated.Then,the crystallization curve of the seed crystal was plotted.The experimental results suggest that MFI seeds grew very fast when using hydrophilic fumed silica with specific surface area of 100 m^2/g as silica source.The synthesized continuous and dense MFI zeolite film exhibited highly b-orientation.

关 键 词：气相二氧化硅 中性合成条件 二次生长 MFI分子筛晶体 MFI分子筛膜 

分 类 号：TB43[一般工业技术]