Sodium cobaltate was synthesized, characterized (structural and microstructural) and evaluated for CO2 and CO captures. The CO capture was produced via a double reaction mechanism oxidation-chemisorpdon process. The sample structure and composition were studied using the XRD and atomic absorption techniques, which indicated a Na0.89CoO1.95 composition. This ceramic is able to chemically trap CO2, which results in carbonation products such as Na2CO3 and different cobalt oxides. Cobalt was chemically reduced as a function of the carbonation temperature. The Na0.89CoO1.95-CO2 reaction kinetic parameters were determined assuming a first-order reaction. The kinetic constants tend to increase as a function of temperature, and two different Delta H-double dagger values were determined. On the other hand, the Na0.89CoO1.95-CO oxidation and subsequent chemisorption processes were analyzed. CO can be oxidized on sodium cobaltate and chemically trapped above 160 degrees C (total conversion was obtained at 490 degrees C). (C) 2015 Elsevier B.V. All rights reserved.