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The sorption kinetics of single-and binary-component mixtures of CO 2 and CH 4 in porous organic cage (POC) CC3 was investigated by the zero-length column (ZLC) technique for the purpose of understanding the experimental diffusivity values of light gases through this novel branch of porous molecular solids. The intracrystalline diffusivities were measured at 25 °C, and a binary-gas ratio of 10/90 CO 2 /CH 4 was utilized in order to mirror concentrations of CO 2 and CH 4 in natural gas. The diffusion time constants were measured and then compared in order to investigate the effects of coadsorption for binary-gas mixtures and were also compared against molecular simulation diffusion values that have been reported in other works. The diffusion time constants measured for CO 2 for single-and binary-component trials were found to be 1.05 × 10 −3 and 8.70 × 10 −4 s −1 , respectively, whereas for CH 4 , these measured values were estimated to be 1.10 × 10 −3 and 1.03 × 10 −3 s −1 , respectively. Moreover, the diffusion of CO 2 revealed the presence of surface resistances due to adsorbent pore window size limitations that hinder the transport of CO 2 molecules upon diffusion. The findings of this study provide novel experimental kinetic characterizations of the sorption kinetics of CO 2 and CH 4 through CC3 for the separation of CO 2 from natural gas.

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