Separation performance
The gas transport behaviors of the prepared membranes were analyzed by
using a reequipped gas permeation analyzer (MGT-01, Labthink CO.). The
prepared membranes with exposed area of 3.14 cm2 were
sealed in permeation cell by O-ring. After vacuum treating the
permeation system, the feed chamber was filled with the gas to be
measured with pressure of 100 kPa. The permeate gas was analyzed by gas
chromatography. The gas permeability (P, Barrer, 1 Barrer =
10-10 cm3 (STP) cm
cm-2 s-1 cmHg-1)
was calculated based on the permeate gas volume, membrane thickness,
effective area, permeation time, and transmembrane pressure. The
selectivity (αi ) was calculated by the
permeability of two gases:
\(\alpha_{i}=\frac{P_{\text{CO}_{2}}}{P_{\text{CH}_{4}}}\) (3)