Revisiting the Aluminum Trimesate-Based MOF (MIL-96): From Structure Determination to the Processing of Mixed Matrix Membranes for CO2 Capture

Marvin Benzaqui, Renjith S. Pillai, A. Sabetghadam Esfahani, Virginie Benoit, Perine Normand, Jérôme Marrot, Nicolas Menguy, David Montero, William Shepard, Antoine Tissot, Charlotte Martineau-Corcos, Clémence Sicard, Mihail Mihaylov, Florent Carn, Isabelle Beurroies, Philip L. Llewellyn, Guy De Weireld, Konstantin Hadjiivanov, Jorge Gascon, Freek KapteijnGuillaume Maurin, Nathalie Steunou, Christian Serre

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A microporous Al trimesate-based metal-organic framework (MOF), denoted MIL-96-(Al), was selected as a porous hybrid filler for the processing of mixed matrix membranes (MMMs) for CO2/N2 postcombustion separation. First, the structural model of MIL-96-(Al) initially reported was revisited using a combination of synchrotron-based single-crystal X-ray diffraction, solid-state nuclear magnetic resonance spectroscopy, and density functional theory (DFT) calculations. In a second step, pure MIL-96-(Al) crystals differing by their size and aspect ratio, including anisotropic hexagonal platelets and nanoparticles of about 70 nm in diameter, were prepared. Then, a combination of in situ IR spectroscopy, single-gas, and CO2/N2 coadsorption experiments, calorimetry, and molecular simulations revealed that MIL-96-(Al) nanoparticles show a relatively high CO2 affinity over N2 owing to strong interactions between CO2 molecules and several adsorption sites such as Al3+ Lewis centers, coordinated water, and hydroxyl groups. Finally, the high compatibility between MIL-96-(Al) nanoparticles and the 6FDA-DAM polymer allowed the processing of homogeneous and defect-free MMMs with a high MOF loading (up to 25 wt %) that outperform pure polymer membranes for CO2/N2 separation.

Original languageEnglish
Pages (from-to)10326-10338
Number of pages13
JournalChemistry of Materials
Issue number24
Publication statusPublished - 26 Dec 2017

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