Highly Selective Water Adsorption in a Lanthanum Metal–Organic Framework |
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| Authors: | Raoul Plessius Rosa Kromhout Dr André Luis Dantas Ramos Dr Marilena Ferbinteanu Dr Marjo C Mittelmeijer‐Hazeleger Prof Rajamani Krishna Prof Gadi Rothenberg Dr Stefania Tanase |
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| Affiliation: | 1. Van ‘t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam (The Netherlands);2. Environmental Engineering Department, Federal University of Sergipe (UFS) (Brazil);3. Faculty of Chemistry, Inorganic Chemistry Department, University of Bucharest, Dumbrava Rosie 23, Bucharest 020462 (Romania) |
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| Abstract: | We present a new metal–organic framework (MOF) built from lanthanum and pyrazine‐2,5‐dicarboxylate (pyzdc) ions. This MOF, La(pyzdc)1.5(H2O)2] ? 2 H2O, is microporous, with 1D channels that easily accommodate water molecules. Its framework is highly robust to dehydration/hydration cycles. Unusually for a MOF, it also features a high hydrothermal stability. This makes it an ideal candidate for air drying as well as for separating water/alcohol mixtures. The ability of the activated MOF to adsorb water selectively was evaluated by means of thermogravimetric analysis, powder and single‐crystal X‐ray diffraction and adsorption studies, indicating a maximum uptake of 1.2 mmol g?1 MOF. These results are in agreement with the microporous structure, which permits only water molecules to enter the channels (alcohols, including methanol, are simply too large). Transient breakthrough simulations using water/methanol mixtures confirm that such mixtures can be separated cleanly using this new MOF. |
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| Keywords: | adsorption desiccant lanthanides metal– organic frameworks |
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