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Relationships between the sorption behaviour of methane, carbon dioxide, nitrogen and ethane on coals

机译：甲烷，二氧化碳，氮和乙烷在煤上的吸附行为之间的关系

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Sequestration of carbon dioxide in coal seams can reduce emissions of carbon dioxide to the atmosphere. If such sequestration simultaneously results in enhanced coal bed methane (ECBM) production, some of the sequestration costs can be recovered by the value of the methane produced. This requires knowledge of both the carbon dioxide and methane sorption behaviour of coal at high pressures. In order to elucidate the connection between them, we investigated the sorption of carbon dioxide, methane, ethane and nitrogen at 55 ℃ at pressures up to 20 MPa for a number of coals. Sorption isotherms were fitted by a modified Dubinin-Radushkevich model. The maximum sorption capacities of the coals for the different gases were found to be highly correlated. The relationship between maximum sorption capacity of a coal for a gas and its critical temperature was approximately proportional. The relationship between methane and nitrogen maximum sorption capacity was particularly close: on a volume basis, the maximum sorption capacity of all coals examined for methane was twice that of nitrogen. The ratio of maximum sorption capacity of carbon dioxide and methane decreased linearly with increasing carbon content. The ethane/methane sorption ratio also tended to decrease with increasing rank though to a smaller extent, indicating that the proportionally greater sorption at low rank coals is not unique to carbon dioxide. The heat of sorption tends to increase with increasing vitrinite reflectance; this may reflect the greater polar-isability of higher rank coals (which also determines their reflectance).
机译：隔离煤层中的二氧化碳可以减少向大气排放的二氧化碳。如果这种螯合同时提高了煤层气（ECBM）的产量，那么一些螯合成本可以通过产生的甲烷的价值来弥补。这需要了解煤在高压下对二氧化碳和甲烷的吸附行为。为了阐明它们之间的联系，我们研究了在55℃，压力高达20 MPa下许多煤对二氧化碳，甲烷，乙烷和氮气的吸附。吸附等温线通过改良的Dubinin-Radushkevich模型拟合。发现煤对不同气体的最大吸附能力高度相关。煤对气体的最大吸附能力与其临界温度之间的关系大致成比例。甲烷和氮的最大吸附能力之间的关系特别密切：按体积计算，所有煤中甲烷的最大吸附能力是氮的两倍。二氧化碳和甲烷的最大吸附容量之比随碳含量的增加而线性降低。乙烷/甲烷吸附率也趋于随等级增加而降低，尽管程度较小，这表明在低等级煤中成比例地更大的吸附并非二氧化碳独有。吸附热倾向于随着镜质体反射率的增加而增加。这可能反映出较高品位的煤具有更高的极性（这也决定了它们的反射率）。

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