Contribution of Ash Content Related to Methane Adsorption Behaviors of Bituminous Coals

摘要: Methane adsorption isotherms on coals with varying ash contents were investigated. The textural properties characterized by N2 adsorption/desorption isotherm at 77 K, and methane characteristics measured pressures up to 4.0 MPa 298 K, 313 K, 328 K, respectively. Dubinin-Astakhov model the Polanyi potential theory employed fit experimental data. As a result, content correlated strongly capacity. Over range studied, 9.35% 21.24%, average increase in capacity was 0.021 mmol/g for each 1.0% rise content. With increasing of 21.24%~43.47%, reduction maximum capacities observed. In addition, there positive correlation between saturated specific surface area micropore volume samples. Further, this study presented heat adsorption, isosteric adsorbed phase various coals. Employing proposed thermodynamic approaches, maps processes coalbed conducive understanding coal gas simultaneous extraction.