Isothermal adsorption experiments of pure CO2 and CH4 on different coals in rank (the No.11 Coal from the Linnancang Mine and the No.9 Coal from the Majiagou Mine) from the Kailuan Coalfield of Hebei Province, China, have been studied. Four different models (Langmuir, BET, D-R, and D-A) were used to fit the experimental data of CO2 and CH4 adsorption and their fitting degree were investigated. The results showed that the adsorption capacity of the Majiagou coal(Ro, ran=1.21%)is higher than that of the Linna...