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Highly porous carbons have been prepared by the chemical activation of two mesoporous carbons obtained by using hexagonal- (SBA-15) and cubic (KIT-6)-ordered mesostructured silica as hard templates. These materials were investigated as sorbents for CO₂ capture. The activation process was carried out with KOH at different temperatures in the 600–800°C range. Textural characterization of these activated carbons shows that they have a dual porosity made up of mesopores derived from the templated carbons and micropores generated during the chemical activation step. As a result of the activation process, there is an increase in the surface area and pore volume from 1020m²g⁻¹ and 0.91cm³g⁻¹ for the CMK-8 carbon to a maximum of 2660m²g⁻¹ and 1.38cm³g⁻¹ for a sample activated at 800°C (KOH/CMK-8 mass ratio of 4). Irrespective of the type of templated carbon used as precursor or the …