Carbonation process of calcium-based sorbent, as a promising technique for CO2 capture, was examined in a fixed-bed reactor. A method was established to calculate the exact adsorption capacity using CO2 Non-Dispersive Infrared Radiation (NDIR) analyzer as the analytical unit. The factors affecting the carbonation process of calcium-based sorbent were investigated thoroughly. The conversion and adsorption capacity of sorbent reached 65% and 41%, respectively, when CO2 partial pressure was 0.01 MPa at 600 °C, exhibiting an obvious advantage in terms of a relatively low carbonation temperature. The results showed a first-order reaction with respect to CO2 partial pressure. Increasing carbonation pressure was an effective method to improve adsorption capacity, and conversion and adsorption capacity of sorbent achieved 85% and 53% at 1.3 MPa, respectively. The existence of water was beneficial to the carbonation process and the influence can be explained by the process of water hydration of CaO. The Random Por...