The regulation of metal cations in zeolites via ion exchange to enhance CO₂ adsorption performance holds significant potential for the efficient industrial capture of CO₂. To investigate the correlation between metal cation exchange time and CO₂ adsorption performance of zeolites, four adsorbent samples (e.g. Ca?LTA?30) were prepared with exchange time as the independent variable. The textural properties, thermal stability, CO₂ temperature?programmed desorption (CO₂?TPD), and CO₂ adsorption performance of these samples were characterized. Furthermore, the IAST (Ideal Adsorbed Solution Theory) selectivity of these samples for CO₂/N₂ gas mixtures with different volume ratios (20∶80, 50∶50, 80∶20) was compared. The results indicate that the CO₂ adsorption performance of LTA can be increased from 5.02 mmol/g to 6.05 mmol/g, while the S_CO {}_{{}_{}^{}} _/N {}_{{}_{}^{}} can be improved from 59.7 to 118.5. In addition, through comparing the fitting performance of four adsorption models on the adsorption isotherms of CO₂ and N₂ on LTA and Ca?LTA series samples, it is found that the Langmuir?Freundlich model exhibits the best consistency with the experimental data and can effectively evaluate the CO₂ adsorption behavior of the Ca?LTA series samples.