Fig. 4: Study of CO2/N2 gas adsorption and separation behavior. | Nature Communications

Fig. 4: Study of CO2/N2 gas adsorption and separation behavior.

From: Nutrient diffusion-inspired catalysts with self-reinforced concentration gradient for sustainable electroreduction of dilute CO2

Fig. 4

a CO2 adsorption isotherm at 298.15 K on PC NSs, Ni-CNTs30/PC, Ni-CNTs60/PC, Ni-CNTs90/PC, Ni-CNTs180/PC, and Ni-CNTs30. b Corresponding CO2/N2 IAST selectivity at 298.15 K and 1.0 bar for the binary mixture of CO2/N2 (15/85). c Pore-size distribution curves for PC NSs, Ni-CNTs30/PC, Ni-CNTs60/PC, Ni-CNTs90/PC, Ni-CNTs180/PC, and bare Ni-CNTs30. d Schematic illustration of the column breakthrough experiments, analogous to the MEA cell experiments. e Experimental column breakthrough curves for dry condition and 60% of RH CO2/N2 (v/v = 15/85) separations of PC NSs, Ni-CNTs30/PC, and Ni-CNTs180/PC. f Schematic of a two-bed VSA process by Aspen adsorption. The Aspen simulation results of CO2 recovery and purity (g), CO2 velocity and corresponding h LDF coefficient, and the i total energy consumption for the CO2 separation process in Ni-CNTs30/PC, Ni-CNTs180/PC, and Ni-CNTs30. Source data are provided as a Source Data file.

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