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Porous organic cages for sulfur hexafluoride separation

DOI: 10.1021/jacs.5b11797 DOI Help

Authors: Tom Hasell (University of Liverpool) , Marcin Miklitz , Andrew Stephenson (University of Liverpool) , Marc Little (University of Leeds; University of Liverpool) , Sam Chong (University of Liverpool) , Rob Clowes (University of Liverpool) , Linjiang Chen (University of Liverpool) , Daniel Holden (University of Liverpool) , Gareth A. Tribello (Queen’s University Belfast) , Kim E. Jelfs (Imperial College London) , Andrew I. Cooper (University of Liverpool)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The American Chemical Society , VOL 138 (5)

State: Published (Approved)
Published: January 2016
Diamond Proposal Number(s): 8728 , 9282

Open Access Open Access

Abstract: 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.

Journal Keywords: Porous organic cages; microporous; SF6; gas separation, crystal engineering.

Subject Areas: Chemistry, Materials

Instruments: I11-High Resolution Powder Diffraction , I19-Small Molecule Single Crystal Diffraction

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