煤质技术2025，Vol.40Issue(3)：69-75,85,8.DOI:10.3969/j.issn.1007-7677.2025.03.008
不同煤阶煤纳米孔隙结构及其对CO2/CH4选择性吸附的影响
Nano-pore structure of different rank coals and its effect on selective adsorption of CO2 over CH4
摘要
Abstract
In the context of CO2-ECBM,studying the influence of coal's nanopore structure on the selective ad-sorption of CO2/CH4 can effectively improve the accuracy when predicting the displacement efficiency of CO2 on CH4.To study the relationship between selective adsorption of CO2 over CH4 and nano-pore structure of coal,low pressure N2/CO2 adsorption and high-pressure CO2/CH4 adsorption experiments were conducted using four coals of different rank.The nano-pore structure and adsorption properties for CO2/CH4 of the coals were quantitatively characterized.Meanwhile,the effect of pore structure on selective adsorption capacity of CO2/CH4 was analyzed.The control effect of coal pore structure on CO2/CH4 selective adsorption were discussed.The results indicate that the specific surface area and pore volume in 1-50 nm range decrease with coal rank,while the values in 0.5-1.0 nm range show an U-shaped trend with coal rank.In addition,the adsorption of CO2 and CH4 can be well described by Langmuir equa-tion.The single molecular layer saturation capacity decreases with increasing temperature.The adsorption constant of CO2 is significantly higher than that of CH4.Moreover,the selectivity coefficients of CO2/CH4 range from 3.89 to 7.97,the value of which decreases with temperature but increases with the specific surface area of micropores,indi-cating that micropore distribution is beneficial for improving the selectivity of CO2 over CH4.关键词
纳米孔隙结构/选择性吸附/煤阶/低压N2/CO2吸附/CO2/CH4吸附试验/吸附等温线/Langmuir方程Key words
nano-pore structure/selective adsorption/coal rank/low-pressure N2/CO2 adsorption/CO2/CH4 ad-sorption test/adsorption isotherm/Langmuir equation分类
矿山工程引用本文复制引用
刘振建,蒲超,都喜东,嵇洋洋,涂欣雨..不同煤阶煤纳米孔隙结构及其对CO2/CH4选择性吸附的影响[J].煤质技术,2025,40(3):69-75,85,8.基金项目
云南省基础研究计划基金资助项目(202401AT070406,202101BE070001-039) （202401AT070406,202101BE070001-039）
江苏省大学生创新创业训练基金资助项目(202310305131H) （202310305131H）
