Porous organic cages for sulfur hexafluoride separation

Tom Hasell, Marcin Miklitz, Andrew Stephenson, Marc A. Little, Samantha Y. Chong, Rob Clowes, Linjiang Chen, Daniel Holden, Gareth Tribello, Kim E. Jelfs, Andrew I. Cooper

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A series of porous organic cages is examined for the selective adsorption of sulphur hexafluoride (SF6) over nitrogen. Despite lacking any metal sites, a porous cage, CC3, shows the highest SF6/N2 selectivity reported for any material at ambient temperature and pressure, which translates to real separations in a gas breakthrough column. The SF6 uptake of these materials is considerably higher than would be expected from the static pore structures. The location of SF6 within these materials is elucidated by x-ray crystallography, and it is shown that cooperative diffusion and structural rearrangements in these molecular crystals can rationalize their superior SF6/N2 selectivity.
Original languageEnglish
Number of pages9
JournalJournal of the American Chemical Society
Early online date13 Jan 2016
Publication statusEarly online date - 13 Jan 2016


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