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ABSTRACT
Equilibrium adsorbed amount and selectivity of adsorbents are investigated using the Ideal Adsorption Solution Theory (IAST) to determine suitable adsorbents for nitrogen/methane separation. The results revealed that among the nitrogen selective adsorbents, Sr-ETS-4 has the highest nitrogen/methane selectivity and among the selective adsorbents toward methane, CMS-3 K and Cu-MOF have the highest adsorbed amount and selectivity, respectively. It was found that MOFs have great potential for methane adsorption and separation. However, carbon-based adsorbents have the highest adsorption capacity for methane. Finally, a novel trade-off plot of adsorbed amount versus selectivity was constructed as a simple guide for researchers and industrial applications.
Nomenclature
| b | = | Affinity parameter of Langmuir, Toth and Sips isotherms (kPa−1) |
| n | = | Heterogeneity parameter in Sips isotherm (-) |
| p | = | Pressure (kPa) |
| qsat | = | Saturation adsorption capacity of adsorbent (mmol.g−1) |
| q | = | Amount adsorbed (mmol.g−1) |
| T | = | Temperature (K) |
| MOF | = | metal-organic framework |
| IAST | = | Ideal Adsorption Solution Theory |