标题：Preferential adsorption behaviour of CH4and CO2on high-rank coal from Qinshui Basin, China
作者：Yu, Hongguan ;Jing, Renxia ;Wang, Panpan ;Chen, Lihui ;Yang, Yongjie
作者机构：[Yu, Hongguan ;Yang, Yongjie ] Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, 更多
来源：International Journal of Mining Science and Technology
摘要：In order to better understand the prevailing mechanism of CO2storage in coal and estimate CO2sequestration capacity of a coal seam and enhanced coalbed methane recovery (ECBM) with CO2injection into coal, we investigated the preferential adsorption of CH4and CO2on coals. Adsorption of pure CO2, CH4and their binary mixtures on high-rank coals from Qinshui Basin in China were employed to study the preferential adsorption behaviour. Multiple regression equations were presented to predict CH4equilibrium concentration from equilibrium pressure and its initial-composition in feed gas. The results show that preferential adsorption of CO2on coals over the entire pressure range under competitive sorption conditions was observed, however, preferential adsorption of CH4over CO2on low-volatile bituminous coal from higher CH4-compostion in source gas was found at up to 10 MPa pressure. Preferential adsorption of CO2increases with increase of CH4concentration in source gas, and decreases with increasing pressure. Although there was no systematic investigation of the effect of coal rank on preferential adsorption, there are obvious differences in preferential adsorption of gas between low-volatile bituminous coal and anthracite. The obtained preferential adsorption gives rise to the assumption that CO2sequestration in coal beds with subsequent CO2-ECBM might be an option in Qinshui Basins, China. © 2014 Published by Elsevier B.V. on behalf of China University of Mining and Technology.