A series of glucose-based porous carbons (C-GLCs-800) were developed by simple carbonization and KOH activation

and characterized by scanning emission microscopy (SEM)

nitrogen sorption

Fourier transformed infrared (FI-TR) and thermogravimetric analysis (TGA). Pure component adsorption isotherms of CO2 and CH4 were measured separately at 288

298

and 308 K. The ideal adsorbed solution theory (IAST) model was used to estimate adsorption selectivity of the samples for CO2/CH4 binary mixtures. Results showed that the specific surface area and total pore volume of C-GLCs-800 increased at first and then decreased with the ratio of KOH/C at which the samples were activated. The BET surface area and total pore volume of C-GLC-800-4 reached as high as 3153 m2·g-1 of 2.056 cm3·g-1

respectively. The narrow micropores voulme of C-GLC-800-2 reached as high as 0.3538 cm3·g-1. The C-GLC-800-2 exhibited an extraordinary CO2 adsorption capacity of 3.96 mmol·g-1 at 298 K under 105 Pa

which was comparable to many traditional adsorbents and MOFs. The isosteric heats of CO2 adsorption on C-GLC-800-2 was higher than that of CH4. The IAST-predicted CO2/CH4 selectivity was about 8.35.