MOF-in-COF molecular sieving membrane for selective hydrogen separation

Hongwei Fan, Manhua Peng, Ina Strauss, Alexander Mundstock, Hong Meng () and Jürgen Caro ()
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Hongwei Fan: Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover
Manhua Peng: Institut für Festkörperphysik, Leibniz Universität Hannover
Ina Strauss: Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover
Alexander Mundstock: Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover
Hong Meng: Beijing University of Chemical Technology
Jürgen Caro: Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept for the confined growth of metal-organic framework (MOFs) inside a supported COF layer to prepare MOF-in-COF membranes. These membranes feature a unique MOF-in-COF micro/nanopore network, presumably due to the formation of MOFs as a pearl string-like chain of unit cells in the 1D channel of 2D COFs. The MOF-in-COF membranes exhibit an excellent hydrogen permeance (>3000 GPU) together with a significant enhancement of separation selectivity of hydrogen over other gases. The superior separation performance for H2/CO2 and H2/CH4 surpasses the Robeson upper bounds, benefiting from the synergy combining precise size sieving and fast molecular transport through the MOF-in-COF channels. The synthesis of different combinations of MOFs and COFs in robust MOF-in-COF membranes demonstrates the versatility of our design strategy.

Date: 2021
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DOI: 10.1038/s41467-020-20298-7

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