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Issue 1, 2017
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On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes

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Abstract

Double-layered zeolitic imidazolate framework (ZIF) membranes were fabricated inside polyimide P84 hollow fibers by a step-synthesis conducted by microfluidic technology and applied to pre-combustion gas separation. Our hypothesis, based on the information provided by a combination of molecular simulation and experiments, is that a CO2 adsorption reduction on the surface of the ZIF-9 would enhance the molecular sieving effect of this ZIF-9 layer and therefore the selectivity in the H2/CO2 mixture separation of the entire membrane. This reduction would be achieved by means of a less-CO2-adsorptive methylimidazolate-based ZIF-67 or ZIF-8 layer coating the ZIF-9. ZIF-8/ZIF-9 and ZIF-67/ZIF-9 double-layered membranes were prepared and characterized by XRD, FTIR, SEM, FIB, TEM and EDS. This unprecedented strategy led to a H2/CO2 separation selectivity of 9.6 together with a 250 GPU H2 permeance at 150 °C, showing a significant improvement with respect to the pure ZIF-9 membrane. Double-layered membranes also showed higher apparent CO2 activation energies than single-layered membranes, attributable to a diminished adsorption.

Graphical abstract: On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes

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Publication details

The article was received on 03 Jun 2016, accepted on 06 Aug 2016 and first published on 09 Aug 2016


Article type: Edge Article
DOI: 10.1039/C6SC02411D
Citation: Chem. Sci., 2017,8, 325-333
  • Open access: Creative Commons BY-NC license
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    On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes

    F. Cacho-Bailo, I. Matito-Martos, J. Perez-Carbajo, M. Etxeberría-Benavides, O. Karvan, V. Sebastián, S. Calero, C. Téllez and J. Coronas, Chem. Sci., 2017, 8, 325
    DOI: 10.1039/C6SC02411D

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