Zero length column (ZLC) technique is a powerful technique for diffusivity measurement of pure gases on porous solids [25]. The procedure is to saturate a small amount of adsorbent with a diluted mixture of the adsorbate till equilibrium in the adsorbed phase is reached. Then the inlet is switched to an inert stream to clean the adsorbent. From this desorption curve the diffusivity and equilibrium parameters are extracted. It has been extensively used for diffusivity measurements in zeolites [26–28]. Combined macro–micropore control in bidisperse adsorbents were also considered in literature [29].