Abstract
In this work, we have measured the adsorption isotherms and calculated the equilibrium selectivity for CO2, CH4, and N2 on micro-mesoporous nanographene at three temperatures of 298 K, 278 K, and 263 K and pressures up to 760 Torr. The nanographene sample possesses a particle size range of 50 nm to 250 nm along with a Brunauer–Emmett–Teller (BET) specific surface area of 514 m2/g and total pore volume of 3 cm3/g. The pore widths varied from 3.5 A to 8 A in the microporous region and very large distributed widths within 45 A to 250 A in the region of mesoporosity. The calculated equilibrium selectivity of gas separation at 298 K by pressure swing adsorption for CO2/N2, CO2/CH4, and CH4/N2 are 55, 8.2, and 6.5, respectively, whereas the adsorption selection parameters for same pair of gases are 540, 101, and 117, respectively. To compare the equilibrium selectivity values with other adsorbents, we have measured the gas adsorption isotherms for CO2, CH4, and N2 on Maxsorb (a commercial activated carbon with ...
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