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Energies 2021, 14, 3582 Figure 3. Schematic of breakthrough curve experimental device. 7 of 15 Figure 4. Schematic of three-bed nine-step PSA process experimental device. Figure 4. Schematic of three-bed nine-step PSA process experimental device. 3. Results and Discussion 3. Results and Discussion 3.1. Adsorption Isotherms 3.1. Adsorption Isotherms The CO2 and N2 adsorption capacities on EIKME 13X zeolite were measured using The CO2 and N2 adsorption capacities on EIKME 13X zeolite were measured using the microbalance Thermo D-200. The results show that the CO2 adsorption capacity on the microbalance Thermo D-200. The results show that the CO2 adsorption capacity on the the adsorbent was considerably greater than the N2 adsorption capacity on the adsorbent, adsorbent was considerably greater than the N2 adsorption capacity on the adsorbent, im- Energies 2021, 14, x FOR PEER REVIEW 8 of 15 implying that zeolite 13X can separate these two gas components. The extended Langmuir– plying that zeolite 13X can separate these two gas components. The extended Langmuir– Freundlich isotherm (Equation (4)) was used as the equilibrium adsorption model, and Freundlich isotherm (Equation (4)) was used as the equilibrium adsorption model, and the parameters were fitted using MATLAB Curve Fitting Toolbox. All the parameters the parameters were fitted using MATLAB Curve Fitting Toolbox. All the parameters are are presented in Table 4. We can use the isotherm equation to calculate and predict the presented in Table 4. We can use the isotherm equation to calculate and predict the ad- adsorption capacity of each component under different temperatures and pressures. The sorption capacity of each component under different temperatures and pressures. The iso- isotherm curves and the error bars of 95% confidence intervals are shown in Figure 5. therm curves and the error bars of 95% confidence intervals are shown in Figure 5. (a) (b) FiguFreig5u.rAed5s.oArdpstiornptiisonthiesormtheorfm(ao)fC(Oa)CaOnd2 a(bn)dN(b)oNn2EoInKMEIEKM13EX1z3eXolziteo.lite. Components ai,1 (mol/kg) ai,2 (mol/K·kg) bi,0 (1/atm) bi,1 (K) mi,1 (-) mi,2 (K) CO2 6.507 −3 × 10−3 8 × 10−3 1.722 × 103 6.013 × 10−1 −2.4 × 101 N2 1.185 × 103 −1.022 ×1 0−1 4.842 × 10−4 6.215 × 102 1.182 −1.2 × 102 3.2. Breakthrough and Desorption Curve Verification 22 Table 4. Extended Langmuir–Freundlich isotherm parameters of CO2 and N2 on zeolite 13X.PDF Image | CO2 captured from flue gas using the PSA process
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