Porous Organic Cages for Sulfur Hexafluoride Separation

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• 作者：Tom Hasell ; Marcin Miklitz ; Andrew Stephenson ; Marc A. Little ; Samantha Y. Chong ; Rob Clowes ; Linjiang Chen ; Daniel Holden ; Gareth A. Tribello ; Kim E. Jelfs ; Andrew I. Cooper
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：138
• 期：5
• 页码：1653-1659
• 全文大小：546K
• ISSN：1520-5126

文摘

A series of porous organic cages is examined for the selective adsorption of sulfur 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.