Open AccessPorous Organic Cages for Sulfur Hexafluoride Separation
Author(s) -
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
Publication year - 2016
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.5b11797
Subject(s) - chemistry , selectivity , sulfur hexafluoride , adsorption , nitrogen , sulfur , porosity , gas separation , porous medium , cage , gaseous diffusion , diffusion , chemical engineering , inorganic chemistry , organic chemistry , membrane , thermodynamics , catalysis , physics , biochemistry , mathematics , electrode , combinatorics , engineering
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.
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