We have explored the role of pore width, specific surface area, and conductivity nanoporous carbons on their adsorption capacity CO2, CH4, N2. Graphene sheets with a width 7.35 Å (522.65 m2/g) activated carbon (2445.38 been generated using user-written code Hybrid Reverse Monte Carlo (HRMC) algorithm. numerically shown that graphene enhance gas separation properties, i.e., CO2 CH4 from N2 in bi...