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Highly Selective Adsorption of Perfluorinated Greenhouse Gases by Porous Organic Cages

“…[ 6 ] Although these measures seem dramatic, the reports on the adsorption of PFCs by porous materials are sparse and focusing on gas uptake only. [ 8b,13,14 ] While CF 4 was studied more in detail, [ 15 ] for C 2 F 6 mainly theoretical studies suggest the use of activated carbon materials as potential selective adsorbents. [ 13a,16 ] Indeed, experimental uptakes of up to 1.26 mmol g −1 of C 2 F 6 for activated carbons and 1.55 mmol g −1 for zeolite 13X (at 1 bar and 303 K) were determined, yet the low isosteric heats of adsorptions of <25 kJ mol −1 indicate no strong interactions between adsorbents and the gas.…”

“…For instance, for C 3 F 8 gas adsorption till date there is only one study concluding that activated carbons can reach isosteric heat of adsorptions >40 kJ mol −1 . [ 14 ] Yet, for none of the above discussed materials selectivities, e.g., against nitrogen were discussed. By penetration experiments, a potential separation of CF 4 , C 2 F 6 , and C 3 F 8 from other gases was discussed for poly(dimethylsiloxane) and was rationalized on the significantly lower permeability of these gases.…”