for 12 h before any measurement. The Brunauer-Emmett-Teller (BET) specific surface area and porosity were estimated by volumetric adsorption with an ASAP 2020 Micromeritics instrument, using N2 as adsorbate at 196 °C. A typical measurement used 40 mg of sample. For the BET specific surface area calculation, the 0.01-0.1 p/p0 pressure range was used to fit the data. Within this range, all the Rouquerol consistency criteria are satisfied. The materials (micro)porosity was determined from the CO2 adsorption isotherms collected at T = 0 °C, using a 2D non-local density functional theory (2D-NLDFT) method successfully employed for carbonaceous materials with heterogeneous surfaces. The same kind of pore size distribution (PSD) can also be obtained from N2 isotherms at T = 196 °C. CO2 adsorption isotherms were measured at 0 and 25 °C up to the maximum pressure of 1.2 bar. The isosteric heat of adsorption (Qst) was calculated working on the CO2 isotherms measured at 0 and 25 °C, by applying a variant of the Clausius-Clapeyron equation (Equation ):