Are there materials permeable to $\ce{O2}$ and $\ce{CO2}$ but not $\ce{N2}$?

Would this even be possible in theory? Can it be done at even at pressures of 300 atm?

  • 1
    $\begingroup$ Permeable is not a 0/1 quality. For three unpolar small gas molecules, the difference in permeability for each will never be very much different, but certainly it will be different. $\endgroup$ – Karl May 20 '19 at 6:19

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