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  To separate nitrogen and oxygen, carbon adsorbents should have selectivity and it comes from the difference in adsorption velocity. Figs. 6 and 7 show the diffusion rate to the CMS of oxygen and nitrogen. Oxygen is adsorbed rapidly while nitrogen exhibits a relatively slow adsorption. During long-time diffusional uptake in Fig. 7, the fractional uptake of nitrogen  yields almost linear tendency. In the initial uptake curve, oxygen diffuses rapidly on the carbon molecular sieves and this adds selectivity.
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