Where Pi is the permeance of species i (mol m−2 s−1 Pa−1); Qi is the gas flow rate at the permeate side (mol s−1), pf and pp are the feed and permeate pressures (Pa); and A is the active membrane area (m2). The H2/CO2binary mixture gas separation tests were performed using the setup shown in Fig. 2. The gas separation experiments were conducted with an equimolar mixture of H2/CO2 at 25 ˚C. Permeate and retentate compositions were analyzed using gas chromatography (GC-3800, Varian, TCD detector). The selectivity (α) of membrane was calculated using equations 2.