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Preparation of KAUST-7 Gas Separation Membrane by Inorganic Pillar Center-Facilitated Secondary Growth Method

Authors： CUI Yanwen, LV Jinyin, YANG Jianhua, LU Jinming, ZHANG Yan

Units： State Key Laboratory of Fine Chemicals, Institute of Adsorption and Inorganic Membrane, Dalian University of Technology, Dalian 116024, China

KeyWords： KAUST-7 membrane; inorganic pillar center; secondary growth method; H2 separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(5):24-32

Abstract：

The ultra-microporous KAUST-7 fluorinated metal-organic framework contains pores with a size of 3.0-4.8 Å and has the specific adsorption for propylene and CO2, which is a potential membrane material candidate for the separation of small-molecule gases. In this study, the inorganic pillar center-facilitated secondary growth method was proposed to fabricate continuous KAUST-7 membranes. Firstly, KAUST-7 crystals were synthesized via inorganic pillar center-facilitated method. The size and morphology of KAUST-7 crystals were manipulated by adjusting ethanol volume ratio in the solvent, under the optimized condition, nano KAUST-7 crystals (~70 nm) were obtained. The KAUST-7 membrane fabricated by secondary growth on α-Al2O3 tubes using (NbOF5)2- inorganic pillar as fluorine and niobium sources, and the effect of seed layer prepared by hot dip-coating method and layer by layer (LBL) method were investigated. The KAUST-7 membrane with higher separation performance was fabricated by LBL seed method, which showed a H2 permeance of 2.23 × 10-7 mol·m-2·s-1·Pa-1 and achieved the ideal selectivities up to 24.86, 17.34 and 12.95 for H2/CO2, H2/N2 and H2/CH4, respectively. The substitution of concentrated HF with pre-synthesized NiNbOF5 inorganic pillar center avoids the hydrofluoric acid corrosion to α-Al2O3 supports by one-pot synthesis, which contributed to the fabrication of gas-separation membrane under mild conditions.

Funds：

国家自然科学创新群体项目(NO.22021005); 国家自然科学项目(NO.21776032)

AuthorIntro：

崔燕雯(1996-)，女，新疆昌吉人，硕士研究生,研究方向为MOF膜的制备与应用, E–mail：cuiyanwen20@163.com

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