Issue 8, 2022

Seed assisted synthesis of an anionic metal–organic framework membrane for selective and permeable hydrogen separation

Abstract

Hydrogen selective metal–organic framework (MOF) membranes with excellent performance are still in high demand. Here, we are developing an anionic MOF material of CPM-5 into a membrane for H2 separation. A well inter-grown CPM-5 membrane is successfully synthesized on a macroporous glass-frit disk by secondary growth assisted with a pre-deposited seed layer. The anionic framework of CPM-5 can interact strongly with CO2, N2 and CH4 rather than H2, shown by the isosteric heats of adsorption in a sequence of CO2 (39.4 kJ mol−1) > N2 (28.4 kJ mol−1) > CH4 (25.1 kJ mol−1) > H2 (6.1 kJ mol−1). The synthesized CPM-5 membrane is investigated for gas separation of H2/CO2, H2/N2 and H2/CH4. The results from binary gas permeation show separation factors of 39.4, 27.3 and 16.7 for H2/CO2, H2/N2 and H2/CH4, respectively; and a H2 permeance of 11.2–12.0 × 10−7 mol m−2 s−1 Pa−1. The selective separation of H2 from CO2, N2 and CH4 is governed by charge-induced adsorption, and verified by the gas adsorption results. The product of separation factor and H2 permeance exceeds the latest upper bound of polymer membranes and surpasses that of most MOF membranes. In addition, the CPM-5 membrane is thermally stable, durable and reproducible, exhibiting great potential for industrial hydrogen recycling.

Graphical abstract: Seed assisted synthesis of an anionic metal–organic framework membrane for selective and permeable hydrogen separation

Article information

Article type
Research Article
Submitted
22 Kax 2021
Accepted
13 Nah 2022
First published
14 Nah 2022

Inorg. Chem. Front., 2022,9, 1636-1643

Seed assisted synthesis of an anionic metal–organic framework membrane for selective and permeable hydrogen separation

G. Yu, X. Shangguan, Z. Wang, H. Rong, K. Wang, Y. Zhang, T. Shao and X. Zou, Inorg. Chem. Front., 2022, 9, 1636 DOI: 10.1039/D1QI01600H

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