MFI纳米片沉积层气相转化制备超薄b轴取向沸石膜  

Vapor⁃phase transport of MFI nanosheets for the fabrication of ultrathin b⁃axis oriented zeolite membranes

作　　者：陈姣 李毅 谢毅 刁丹丹 肖强 CHEN Jiao;LI Yi;XIE Yi;DIAO Dandan;XIAO Qiang(Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Institute of Advanced Fluorine Containing Materials,Zhejiang Normal University,Jinhua,Zhejiang 321004,China)

机构地区：[1]浙江师范大学,含氟新材料研究所,先进催化材料教育部重点实验室,金华321004

出　　处：《无机化学学报》2024年第3期507-514,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.22075253)资助。

摘　　要：利用乙二胺-水蒸汽进行气相转化(VPT)制备超薄、取向MFI沸石膜,通过将MFI纳米片沉积层转化为致密的沸石膜,实现了膜厚度的有效控制。扫描电子显微镜和X射线衍射表明,制备的沸石膜膜厚度约为280 nm,具有高度b轴取向的致密结构。丁烷异构体双组分分离测试结果表明,在333 K下,等物质的量的正丁烷/异丁烷混合物的正丁烷渗透速率和分离因子分别为1.5×10^(-7)mol·m^(-2)·s^(-1)·Pa^(-1)和14.8。Na_(2)Si O_(3)作为低聚硅源在MFI沸石纳米片二次生长过程中能够提供硅源和碱度,通过在胺类蒸汽中实现MFI沸石纳米片间的融合生长,进一步提高了膜的取向度和致密性。Ultra-thin and b-axis oriented MFI zeolite membranes were fabricated by a vapor phase transport(VPT)method using ethylenediamine-water vapor.The membrane thickness was rationally controlled by converting a deposit layer of MFI nanosheets into a dense zeolite membrane.Scanning electron microscope and X-ray diffraction results revealed that the prepared membrane had a thickness of about 280 nm with a highly b-axis oriented dense structure.The binary gas separation test of butane isomers showed that a permeation rate of n-butane of 1.5×10^(-7) mol·m^(-2)·s^(-1)·Pa^(-1) at a separation factor of 14.8 could be achieved for an equimolar n-butane/iso-butane mixtures at 333 K.Na_(2)SiO_(3),serving as a source of silica and alkalinity,played a crucial role in the secondary growth of MFI zeolite nanosheets.Na2SiO3 facilitated the fusion growth among the MFI zeolite nanosheets in the presence of amine vapor,which improved the orientation and compactness of the membranes.

关 键 词：膜分离 MFI沸石纳米片 气相转化法 低聚硅源 硅酸钠 

分 类 号：O484.1[理学—固体物理] P619.217[理学—物理]