Two-stage membrane cascades for post-combustion CO2 capture using facilitated transport membranes: Importance on sequence of membrane types

•Impact of positioning membranes of different properties in two-stage cascades is studied.•Two classes of industrially validated membranes were used as simulation basis.•Using high permeance membranes as bulk separator in the 1st stage is advantageous.•High selectivity in the 2nd stage helps enhancing CO2 purity.•Combinations of different membranes in two-stage process provide optimal solutions.