The importance of carbon dioxide (CO2) capture is receiving increasing attention as global warming intensifies. The aim of this study was to prepare a zeolite-carbon black (CB) composite for enhancing the CO2 adsorption capacity of zeolites. Therefore, first, the widely used zeolites 13X, 4A, 5A, and beta were synthesized using hydrothermal method and studied by common analysis techniques such as XRD, SEM, XRF, TGA/DTG/DTA, and obtaining N2 adsorption/desorption isotherms at 77K. The results indicate the successful synthesis of this type of zeolites. The CO2/N2 system was considered as a representative of water-free flue gas to study the uptake and separation of CO2. The adsorption isotherms of CO2 and N2 on the synthezied zeolites were measured at 283, 303, and 323 K and up to 1.6 bar utilizing a static volumetric method. Conventional thermodynamic equations were used to adapt the adsorption isotherm data, determine the adsorption heats, and predict binary adsorption data and selectivities of CO2 over N2. Based on the results, due to the superiority of zeolite 13X in CO2 adsorption, it was selected for the preparation of a composite adsorbent. Therefore, the composites were prepared by adding 5 wt. % CB to zeolite 13X crystals via a hydrothermal synthesis method. The properties of the as-prepared composite were characterized by instrumental analysis techniques. The adsorption isotherms of CO2 and N2 on the composite were measured at 283, 303, and 323 K and up to 2.2 bar utilizing a volumetric method. The Toth model was found to correlate the experimental isotherms more accurately. The isostatic heats of adsorption, binary adsorption and the adsorption kinetics of CO2 and N2 on this composite were investigated. The results confirm that the addition of around 5 wt. % CB to zeolite 13X led to significant improvements in the adsorption capacity and rate. The microporous diffusion time constant values for CO2 and N2 at all studied temperatures for the composite were aro