膜科学与技术

纳米SiO2修饰陶瓷中空纤维制备MCM-48分子筛膜

作者：谢继贤，任生缘，周诗健，王学瑞，顾学红

单位：南京工业大学化工学院材料化学工程国家重点实验室化工学院，江苏南京 211816

关键词： MCM-48；中空纤维；介孔分子筛；气体分离膜

出版年,卷(期):页码： 2021,41(6):43-50

摘要：

采用擦涂纳米SiO2颗粒的方法，修饰四通道α-Al2O3中空纤维载体表面，实现了高性能MCM-48分子筛膜的可控制备。通过对比不同修饰方法，发现擦涂纳米SiO2颗粒能有效降低载体的表面粗糙度，同时避免了因内渗带来的载体传质阻力增加。经过两次水热合成，纳米SiO2修饰中空纤维制备MCM-48分子筛膜厚度为3 µm，脱除模板剂前N2渗透性为4.17×10-11 mol·m-2·s-1·Pa-1，表明膜层较为致密。脱除模板剂后，0.2 bar下MCM-48分子筛膜的H2渗透性为4.82×10-7 mol·m-2·s-1·Pa-1，H2/N2理想选择性为3.60；努森扩散对于H2渗透性的贡献为99.69%，符合努森扩散占主导的分离机理。等摩尔H2/N2双组分的分离选择性（2.90）低于理想选择性。孔度渗透实验表明膜平均孔径为2.94 nm，略大于MCM-48本征孔道尺寸。

High selective mesoporous MCM-48 membranes were prepared on four-channel α-Al2O3 hollow fiber with an average pore size of 400 nm. Prior to hydrothermal synthesis, different approaches were used to modify the hollow fibers. The results showed that the nano-sized SiO2 particles were effectively coated on the support surface, reducing the roughness without significant decrease of the gas permeation. The membrane synthesis was optimized based on the hollow fibers modified by rubbing nano-sized SiO2 particles. After twice hydrothermal synthesis, a dense membrane with thickness of 3 µm was obtained. Because of the template accommodation, N2 permeance of the as-synthesized membrane was as low as 4.17×10-11 mol·m-2·s-1·Pa-1. After removing the template, the H2 permeance reached 4.82×10-7 mol·m-2·s-1·Pa-1 and the ideal H2/N2 selectivity was 3.60. The H2 permeation was dominated by the MCM-48 pores, wherein 99.69% H2 permeance was contributed by Knudsen diffusion. The equimolar H2/N2 mixture selectivity (2.90) was lower than the ideal selectivity. The average pore size of the membrane was determined to be 2.94 nm by permporometry, which was slightly larger than the intrinsic pore size of MCM-48 (2.38 nm).

谢继贤（1997-），男，山东济宁，硕士生，主要研究方向为膜分离，E-mail：xiejixian@njtech.edu.cn.

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