Covalent Post-Functionalization of Zeolitic Imidazolate Framework ZIF-90 Membrane for Enhanced Hydrogen Selectivity

Authors

  • Dr. Aisheng Huang,

    Corresponding author
    1. Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover (Germany), Fax: (+49) 511-7621-9121
    • Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover (Germany), Fax: (+49) 511-7621-9121
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  • Prof. Dr. Jürgen Caro

    Corresponding author
    1. Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover (Germany), Fax: (+49) 511-7621-9121
    • Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3A, 30167 Hannover (Germany), Fax: (+49) 511-7621-9121
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  • Financial support by DFG (Ca147/11-3), as a part of the European joint research project “International Research Group: Diffusion in Zeolites”, and DFG Priority Program 1362 “Porous Metal–Organic Frameworks” (Ca147/15-1) is thanked for financial support. The authors thank Dr. A. Feldhoff for support in electron microscopy.

Abstract

original image

MOF constrictor: Covalent modification of a ZIF-90 membrane was achieved by imine condensation of the aldehyde groups of the metal–organic framework (MOF) linker by ethanolamine (see picture). The modification leads to constriction of the pore apertures and prevents unselective permeation through defect pores, thus improving gas separation performance. For a H2/CO2 mixture, selectivity can be increased from 7.3 to 62.5.

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