Chen, C;
Ozcan, A;
Yazaydin, AO;
Ladewig, BP;
(2019)
Gas permeation through single-crystal ZIF-8 membranes.
Journal of Membrane Science
, 575
pp. 209-216.
10.1016/j.memsci.2019.01.027.
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Abstract
Grain boundaries are an unavoidable microstructural feature in intergrown polycrystalline metal-organic framework (MOF) membranes. They have been suspected to be less size-selective than a MOF's micropores, resulting in suboptimal separation performances – a speculation recently confirmed by transmission electron microscopy of MOF ZIF-8. Single-crystal membranes, without grain boundaries, should confine mass transport to micropores and reflect the intrinsic selectivity of the porous material. Here, we demonstrate the feasibility of fabricating single-crystal MOF membranes and directly measuring gas permeability through such a membrane using ZIF-8 as an exemplary MOF. Our single-crystal ZIF-8 membranes achieved ideal selectivities up to 28.9, 10.0, 40.1 and 3.6 for gas pairs CO₂/N₂, CO₂/CH₄, He/CH₄ and CH₄/N₂ respectively, much higher than or reversely selective to over 20 polycrystalline ZIF-8 membranes, unequivocally proving the non-selectivity of grain boundaries. The permeability trend obtained in single-crystal membranes aligned with a force field that had been validated against multiple empirical adsorption isotherms.
| Type: | Article |
|---|---|
| Title: | Gas permeation through single-crystal ZIF-8 membranes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.memsci.2019.01.027 |
| Publisher version: | https://doi.org/10.1016/j.memsci.2019.01.027 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Metal-organic framework, Single crystal, ZIF-8, Gas permeation, Ideal selectivity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10068109 |
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