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SF 6  and SF 6 -N 2  mixed gases are used widely as insulators, but such gases have high greenhouse gas potential. The separation of SF 6  from SF 6 -N 2  mixed gases is an inevitable result of their use. Single-walled carbon nanohorns (CNHs) were used here for a fundamental study of the separation of SF 6  and N 2 . The diameters of the interstitial and internal nanopores of the CNHs were 0.7 and 2.9 nm, respectively. The high selectivity of SF 6  over N 2  was observed only in the low-pressure regime in the interstitial 0.7 nm nanopores; the selectively was significantly decreased at higher pressures. In contrast, the high selectivity was maintained over the entire pressure range in the internal 2.9-nm nanopores. These results showed that the wide carbon nanopores were efficient for the separation of SF 6  from the mixed gas.

Wide Carbon Nanopores as Efficient Sites for the Separation of SF6 from N2