A comparison between the measured equilibria with those obtained using the software CSMGem shows generally good agreement with the theoretical predictions for all reactor temperatures studied (cf. Fig. ). Hence, as the predictive quality of CSMGem has been already confirmed for temperatures above 270 K , it can now be extended to lower temperatures. For CO 2 fractions larger than 10 mol%, deviations between the theoretical and experimental values are always smaller than 1 mol%. For CO 2 fractions smaller than 10 mol%, deviations between experiment and the CSMGem model are considerably larger but do not exceed 2 mol%. Especially at such small mole fractions, deviations can be attributed to insufficiently long relaxation times which lead to an overestimation of the equilibrated mole fractions. Besides, due to the size of the reactor the formation conditions are not as ideally controlled as in lab-scale reactors specifically designed for equilibrium measurements. Consequently, the deviation could also be linked to an inhomogeneous temperature distribution in the reactor.