부산대학교 도서관

The rising energy demands worldwide and difficulty in developing novel clean energy sources have greatly stimulated the exploitation of coalbed methane. Clay minerals are common fractions of coal; thus, understanding their CH4 adsorption capacities and pore structures is vital. In this study, coal, parting, roof, and floor samples were collected from the Yangquan Mining District. The mineral compositions, CH4 adsorption capacities, and pore structures of the samples were analyzed using X-ray diffraction, the CH4 isothermal adsorption method, and the low-temperature N2 adsorption method, respectively. The results indicated that organic matter had a much higher CH4 adsorption capacity (33.80 cm3/g, 35°C) than that of clay minerals. The CH4 adsorption capacities of various clay minerals are significantly different, with smectite (18.01 cm3/g), kaolinite (5.81 cm3/g), mixed-layer illite-smectite (4.47 cm3/g), and illite (2.08 cm3/g) present in decreasing order. The pore sizes of the samples consisted of sizes