In terms of diffusion properties, only a qualitative, preliminary assessment was made in the context of the present study. According to this assessment, diffusion limitations should not play a major role, especially in zeolites with 12MR pore openings. However, numerical modelling of the diffusion properties could be of interest when targeting the application of zeolite membranes for CE removal, where the permeation selectivity of the membrane can be expressed as a product of the adsorption and diffusion selectivities. Another aspect that has not been in the focus here is the regeneration of the zeolite adsorbent.