Anthropogenic CO2 emissions induce global warming due to greenhouse effect. With concentration reaching values higher than 405 ppm in September 2018, the CO2 concentration is moving closer to the 450 ppm critical value [1]. In order to reduce CO2 emissions, adsorption processes (PSA, VPA…) can be used on CO2 emission sites. Such processes require porous materials for the adsorption step. Activated carbons (ACs) have high specific areas and microporous volumes, high CO2 adsorption capacities at low temperature, and high thermal and chemical stability that make them suitable candidates for CO2 capture [2]. In the present study, the CO2 capture performances of ACs derived from phenolic oil were evaluated under realistic conditions. The direct valorization of phenolic oil using a sol-gel process followed by an activation step is an interesting means of valorizing such byproduct of brown-coal pyrolysis. The assessment of ACs textural properties allows a good understanding of CO2 adsorption phenomenon. The evaluation of CO2 capture efficiency under realistic conditions put into perspective the potential use of the ACs in operational systems.