Tailoring the separation properties of flexible metal-organic frameworks using mechanical pressure.

Nature Communications
Nicolas ChanutPhilip L Llewellyn

Abstract

Metal-organic frameworks are widely considered for the separation of chemical mixtures due to their adjustable physical and chemical properties. However, while much effort is currently devoted to developing new adsorbents for a given separation, an ideal scenario would involve a single adsorbent for multiple separations. Porous materials exhibiting framework flexibility offer unique opportunities to tune these properties since the pore size and shape can be controlled by the application of external stimuli. Here, we establish a proof-of-concept for the molecular sieving separation of species with similar sizes (CO2/N2 and CO2/CH4), via precise mechanical control of the pore size aperture in a flexible metal-organic framework. Besides its infinite selectivity for the considered gas mixtures, this material shows excellent regeneration capability when releasing the external mechanical constraint. This strategy, combining an external stimulus applied to a structurally compliant adsorbent, offers a promising avenue for addressing some of the most challenging gas separations.

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Citations

Jun 5, 2020·Chemical Communications : Chem Comm·Pascal FreundStefan Kaskel
Jun 12, 2020·Physical Chemistry Chemical Physics : PCCP·Neil RobinsonMichael L Johns
May 28, 2020·Angewandte Chemie·Simon KrauseSusumu Kitagawa
Sep 17, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Najmeh JarrahDaniel Maspoch
Mar 27, 2021·Annual Review of Chemical and Biomolecular Engineering·M Thommes, C Schlumberger
Jun 19, 2021·ACS Applied Materials & Interfaces·Shotaro HiraideMinoru T Miyahara
Jun 30, 2021·Journal of the American Chemical Society·Giasemi K AngeliPantelis N Trikalitis
Aug 12, 2021·ACS Applied Materials & Interfaces·Alfredo López-OlveraIlich A Ibarra
Aug 13, 2021·Molecular Systems Design & Engineering·Hakan Demir, Seda Keskin
Mar 20, 2020·ACS Applied Materials & Interfaces·Artem S PoryvaevMatvey V Fedin
Nov 3, 2020·The Journal of Physical Chemistry Letters·Francesco WalenszusMuslim Dvoyashkin

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Methods Mentioned

BETA
X-ray
infrared spectroscopy

Software Mentioned

REFPROP

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