CO2 adsorption microcalorimetric experiments were carried out using an isothermal Tian–Calvet type microcalorimeter (model CA- 100 from ITI Company, Del Mar, CA) combined with a homemade volumetric device. Thus, simultaneous measurement of isotherms and calorimetric curves for the adsorption of CO2 were performed at 298 K up to 101 kPa. In order to evaluate the adsorption differ- ential enthalpy from calorimetric data, the so-called discontinuous procedure was employed, which consists of injecting discrete quan- tities of gas in successive steps to the adsorbent. The adsorbed amount was calculated from mass balance of the gas phase by using pressure, volume and temperature measured data. Further details on the experimental procedure can be found in Rouquerol et al. [17] and Silva et al. [18].