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Preparation of KAUST-8 membranes by hydrothermal secondary growth method for H2/CO2 separation

Authors： Asad Sharif, WANG Hongbo, LU Jinming, YANG Jianhua，LIU Yi

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

KeyWords： CO2 separation; KAUST-8 membranes; fluorinated MOF membranes; hydrothermal synthesis; H2 purification

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2024,44(5):90-99

Abstract：

KAUST-8 nanosheets exhibit high surface area and pore volume, leading to exceptional CO2 adsorption due to Al metal sites. In this study, polycrystalline KAUST-8 membranes were developed using a hydrothermal secondary growth technique on coarse microporous α-Al2O3 tube supports, employing aluminum oxide and nickel nitrate precursors. Al2O3 was to control the growth of inorganic pillar \[AlF5(H2O)\]2- and Ni(NO3)2·6H2O for its enhanced solubility of precursor nickel sources, to form Ni(Ⅱ)-pyrazine square grids which reacted with the pillar to grow KAUST-8 crystals. Additionally, water was used as a solvent to promote membrane growth. Moreover, the synthesis conditions of reactant concentration, time, temperature, and effects of solvents were explored. The resulting optimized KAUST-8 membrane demonstrated H2 permeance rate of 1.27×10-7 mol/(m2·s·Pa） (at 25 ℃ and 0.1 MPa) and ideal selectivity of H2/CO2 of 19.3.

Funds：

国家自然科学基金项目（21776031, 22378044)

AuthorIntro：

Asad Sharif（1995-），男，巴基斯坦人，硕士生，从事MOF膜的制备与应用.*通讯作者，E-mail：ljinming@dlut.edu.cn

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