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Corresponding author: Tel.: + 98 21 61112229; Fax: + 98 21 66967784. E-mail: shfatemi@ut.ac.ir (S. Fatemi). AbstractCore-shell nano-adsorbents are a novel class of materials where a solid inert material and a selective ultrafine layer are housed in a single particle. In this work, the dynamic adsorption of CH4CO2 mixture was modelled and studied in the packed bed of conventional and core-shell adsorbents made from SAPO-34, comparatively. The dynamic adsorption model with a packed bed of SAPO-34 fine layer on the inert mullite particles revealed great potential of this kind of adsorbents in increasing the efficiency of the adsorption processes. It was observed that core-shell adsorbent affected on both shape of mass transfer zone and breakthrough time because of decreasing the intraparticle resistance. It is also observed using core-shell adsorbent reduces the useless bed length at the breakthrough time by 22%. The dynamic model was implemented to a fourstep cyclic adsorption process of pressure swing adsorption for purification of methane from a mixture of CO2 and CH4 with the so-called core-shell adsorbent and the results of methane recovery and its purity was compared with the PSA model using SAPO-34 particles. It was concluded that core-shell adsorbents in PSA process increases both the purity and recovery of methane by 4% and 17% respectively, compared to the particles of SAPO-34.

Modeling Based Investigation of Ultrafine SAPO-34 Core-shell Adsorbent in Cyclic Adsorption Process for Purification of Natural Gas from CO2