Abstract The aim of the study was to analyse the effect of temperature on the sorption and diffusion of CO2 and CH4 on hard coal. Four coal samples, characterized by various degrees of coalification, were used in the research. The sorption measurements were carried out in three temperature values: 278 K, 313 K and 353 K and for the consecutive pressure values of 1 bar, 5 bar and 15 bar. Langmuir's sorption capacity in relation to CH4 and CO2 was the highest for the coal with the lowest degree of coalification and was 32.15 cm3/g and 76.4 cm3/g respectively. The lowest Langmuir sorption capacity in relation to CH4 and CO2 were obtained for medium-rank coal (19.23 cm3/g and 29.26 cm3/g) and high-rank coal (20.33 cm3/g and 32.89 cm3/g). The temperature growth resulted in a reduction of the sorption capacity of coal in relation to CH4 and CO2, and that decline was exponential in relation to temperature. The absolute decreases in the total sorption capacity were from 0.03 cm3/g to 0.21 cm3/g in relation to CH4, and from 0.10 cm3/g to 0.51 cm3/g in relation to CO2, per 1 K temperature increase. Within the measurement temperature range of 278–353 K, no „critical temperature point”, above which there is no reduction in CH4 and CO2 sorption, was observed. An increase in the temperature pushed up the values of the effective diffusion coefficients, in relation to CH4 by more than one order of magnitude, and in relation to CO2 by approximately four times. A decrease in the selectivity of CO2/CH4 was also observed along with the coal rank. The ratio of effective diffusion coefficient values D e C O 2 / D e C H 4 for all the investigated coal samples declined strongly along with temperature growth.

中文翻译：

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CH4 和 CO2 在不同温度下对不同煤化程度的硬煤样品进行吸附和扩散

摘要 本研究的目的是分析温度对CO2 和CH4 在硬煤上的吸附和扩散的影响。研究中使用了四种具有不同煤化程度特征的煤样。吸附测量在三个温度值下进行：278 K、313 K 和 353 K，连续压力值分别为 1 bar、5 bar 和 15 bar。Langmuir 对 CH4 和 CO2 的吸附能力在煤化程度最低的煤中最高，分别为 32.15 cm3/g 和 76.4 cm3/g。中阶煤（19.23 cm3/g 和 29.26 cm3/g）和高阶煤（20.33 cm3/g 和 32.89 cm3/g）获得了与 CH4 和 CO2 相关的最低朗缪尔吸附能力。温度升高导致煤对 CH4 和 CO2 的吸附能力降低，这种下降与温度呈指数关系。每增加 1 K 温度，总吸附容量的绝对降低对于 CH4 来说从 0.03 cm3/g 到 0.21 cm3/g，对于 CO2 从 0.10 cm3/g 到 0.51 cm3/g。在 278-353 K 的测量温度范围内，没有观察到“临界温度点”，高于该温度点 CH4 和 CO2 吸附没有减少。温度升高将有效扩散系数的值（相对于 CH4）推高了一个数量级以上，相对于 CO2 推高了大约四倍。还观察到 CO2/CH4 选择性随煤等级的降低。