In order to study the differences in the adsorption/desorption characteristics of methane between the gelification and fusinization in the bituminous coal

the 2# coal seam of the Haishiwan Coal Mine in Minhe Basin is collected as the research object. By using the Langmuir fitting and dual-site Langmuir fitting on the experimental data of isothermal adsorption/desorption respectively

the adsorption thermodynamic characteristics of different fugacity environments are analyzed by calculating the isosteric adsorption heat

and the influence of maceral difference on coalbed methane production is discussed. The results show that: ①The adsorption of methane on the gelification and fusinization in coal accords with the Langmuir function

and the fitting degree is higher than 0.99. The adsorption capacity of the gelification is much higher than that of the fusinization. ②At the same temperature point

there is desorption lag phenomenon in both granular coal and pillar coal

which is due to the difference of adsorption heat. The fitting results of granular coal experiment are larger than those of lump coal experiment. ③The equivalent adsorption heat increases with the increase of fugacity and decreases with the increase of temperature. The influence of adsorption phase density on the equivalent adsorption heat is greater than that of temperature

leading to the adsorption of methane molecules with greater kinetic energy on the coal surface. The equivalent adsorption heat decreases with the increase of temperature as a whole. ④The adsorption capacity of different components of coal is quite different

and areas with high vitrain content should be the first choice for CBM well location deployment.