Separation of CO₂ from Small Gas Molecules Using Deca-Dodecasil 3 Rhombohedral (DDR3) Membrane Synthesized via Ultrasonically Assisted Hydrothermal Growth Method

Table 1

Comparison of different zeolite membranes used for CO₂ separation from CH₄.

Membranes	H2/CO2 selectivity	CO2/CH4 selectivity	CO2/N2 selectivity	CO2 permeance (mol/m^2sPa)	Ref.
MFI membrane	70	—	—		[14]
AlPO-18 membrane	—	220	45		[15]
SAPO-34 membrane	0.44	25	8.30		[13]
DD3R membrane	3.70	—	—		[17]
DD3R membrane	—	—	200		[18]
DD3R membrane	—	—	6.1		[19]