Table 7

Membrane type	Permeance or permeability				Selectivity	Ref.
Membrane type	CO₂	CH₄	N₂	H₂	H₂/CO₂,CO₂/N₂,CO₂/CH₄	Ref.
Membrane type	6.85^a	0.47^a	0.37^a	16	2.34, 18.52, 14.57	[11]
PDMS/PSf	---	3.09^b	2.87^b	62.94^b	-----, -----, ------	[12]
PSf/Silica (85/15 vol.%)	12.9^a	0.62^a	0.67^a	22.7^a	1.76, 19.25, 20.81	[13]
PBN/PI (15 wt.%)	---	1.78^a	---	14.31^a	-----, -----, ------	[14]
Present work	21.5^b	0.54^b	0.49^b	25^b	1.16, 43.88, 39.81

^abarrer (10−10 cm³ (STP)cm/cm² s cmHg)
^bGPU

Table 7: A comparison between the present work and the other studies.