The crystal diffusivity parameters used for the fitting of both gases are listed in Table 8. In all the cases we have verified that the mass transfer coefficient calculated from Eq. (22) is too large and we can consider that film mass transfer resistance is negligible. Also, the macropore diffusion was changed (simulating a tortuosity factor up to 12) and no variations were observed. So we confirm that the control of the diffusion mechanism is really in the micropores for both gases.