Carbon capture and storage has become an alternative means of confronting global warming. Further research and development into adequate and low-cost materials is required for CO 2 adsorption technologies.Samples of fly ash, bottom ash and their respective pellets, produced from wheat bran combustion, were characterized and tested to assess their capacity for CO 2 adsorption at different temperatures. Neither the ashes nor their pellets were subject to prior thermochemical activation.The bottom ash sample and its pellets showed a higher adsorption capacity for the majority of the temperatures studied. The pelletized bottom ash reached the maximum adsorption capacity (0,07 mmol CO 2 /g), followed by the non-pelletized bottom ash (0,06 mmol CO 2 /g); both at an adsorption temperature of 25°C.