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MCM-48 membranes synthesized on ceramic hollow fibers with nano-sized SiO2 modification

Authors： XIE Jixian, REN Shengyuan, ZHOU Shijian, WANG Xuerui, GU Xuehong

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China

KeyWords： MCM-48; hollow fiber; mesoporous molecular sieves; gas separation membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(6):43-50

Abstract：

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).

Funds：

国家自然科学基金重点项目(22035002); 国家自然科学基金青年基金(21908097); 江苏省特聘教授计划; 江苏省“333人才工程“; 江苏省研究生科研与实践创新计划项目(SJCX20-0362).

AuthorIntro：

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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