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首页> 外文OA文献 >Supercritical CO2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals
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Supercritical CO2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals

机译：超临界CO2暴露诱导的表面性质，孔隙结构和各种等级煤中的吸附能力改变

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Carbon dioxide (CO2) has been used to replace coal seam gas for recovery enhancement and carbon sequestration. To better understand the alternations of coal seam in response to CO2 sequestration, the properties of four different coals before and after supercritical CO2 (ScCO2) exposure at 40 °C and 16 MPa were analyzed with Fourier Transform infrared spectroscopy (FTIR), low-pressure nitrogen, and CO2 adsorption methods. Further, high-pressure CO2 adsorption isotherms were performed at 40 °C using a gravimetric method. The results indicate that the density of functional groups and mineral matters on coal surface decreased after ScCO2 exposure, especially for low-rank coal. With ScCO2 exposure, only minimal changes in pore shape were observed for various rank coals. However, the micropore specific surface area (SSA) and pore volume increased while the values for mesopore decreased as determined by low-pressure N2 and CO2 adsorption. The combined effects of surface property and pore structure alterations lead to a higher CO2 adsorption capacity at lower pressures but lower CO2 adsorption capacity at higher pressures. Langmuir model fitting shows a decreasing trend in monolayer capacity after ScCO2 exposure, indicating an elimination of the adsorption sites. The results provide new insights for the long-term safety for the evaluation of CO2-enhanced coal seam gas recovery.
机译：二氧化碳（CO2）已被用于代替煤层气以进行恢复增强和碳封存。为了更好地理解响应于CO2封存的煤层的交替，用傅里叶变换红外光谱（FTIR），低压分析超临界CO2（SCCO2）暴露于40℃和16MPa之前和之后的四种不同煤的性质。氮气和CO 2吸附方法。此外，使用重量法在40℃下在40℃下进行高压CO 2吸附等温。结果表明，在SCCO2暴露后，煤表面上的官能团和矿物质的密度降低，特别是对于低级煤。通过SCCO2曝光，对于各种等级煤观察到孔形状的最小变化。然而，微孔特异性表面积（SSA）和孔体积增加，同时由低压N2和CO 2吸附测定的中孔的值降低。表面性质和孔结构改变的组合效果导致较低压力下的CO 2吸附容量，但在较高压力下降低CO 2吸附容量。 Langmuir模型配件显示SCCO2暴露后单层容量的趋势降低，表明消除吸附位点。结果为评估二氧化碳增强煤层气回收的长期安全性提供了新的见解。

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