College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China; Key Laboratory of China Western Mine and Hazard Prevention, Ministry of Education of China, Xi'an, 710054, Shaanxi, China.
College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China; Key Laboratory of China Western Mine and Hazard Prevention, Ministry of Education of China, Xi'an, 710054, Shaanxi, China.
J Environ Manage. 2024 Sep;368:122094. doi: 10.1016/j.jenvman.2024.122094. Epub 2024 Aug 17.
With the rapid development of Carbon Capture, Utilization and Storage (CCUS) technology, it is necessary to explore the feasibility of coal slime as a porous carbon material for CO capture. In this paper, scanning electron microscopy (SEM) was used to observe the morphological characteristics of coal slime samples with different metamorphic degrees, and the pore structure of coal slime was explored by low temperature N adsorption and low-pressure CO adsorption experiments. The pore distribution characteristics were analyzed, and the adsorption law of different metamorphic degrees were summarized through CO isothermal adsorption experiments. The results showed that: The specific surface area (SSA) and pore volume (PV) of the mesopores of the coal slime exhibited a U-shaped distribution with coal rank, and are much smaller than that of its micropores. Micropores less than 2 nm are the main adsorption space of coal slime, its PV accounted for 59%, 60%, 71%, and SSA accounted for 92%, 93%, 95%, obviously, which are dominant at all stages. The linear correlation fitting coefficients R between the limiting adsorbed amount a of CO and the micropores PV and the SSA were up to 0.830 and 0.887, respectively. The coal slime has good adsorption performance for CO. Based on the Langmuir model to fit the limit adsorption amount, a-value can reach 41.774 cm g, 32.072 cm g, 38.457 cm g at 303 K with the increase of R. Studying the impact of coal slime on CO adsorption performance provides a theoretical basis for the subsequent preparation of energy storage materials and is of great significance for the safe, efficient and economic capture and sequestration of CO, to alleviate the serious situation of the environment and realizing the dual-carbon goal.
随着碳捕获、利用与封存（CCUS）技术的快速发展，有必要探索煤泥作为 CO2 捕集用多孔碳材料的可行性。本文采用扫描电子显微镜（SEM）观察了不同变质程度煤泥样品的形貌特征，通过低温 N2 吸附和低压 CO2 吸附实验，对煤泥的孔结构进行了探索，分析了其孔径分布特征，并通过 CO2 等温吸附实验，总结了不同变质程度煤泥的吸附规律。结果表明：煤泥的中孔比表面积（SSA）和孔体积（PV）随煤阶呈 U 型分布，远小于微孔；小于 2nm 的微孔是煤泥的主要吸附空间，其 PV 占 59%、60%、71%，SSA 占 92%、93%、95%，各阶段均占主导地位；CO2 极限吸附量 a 与微孔 PV 和 SSA 的线性相关拟合系数 R 分别高达 0.830 和 0.887；煤泥对 CO2 具有良好的吸附性能，基于 Langmuir 模型拟合极限吸附量，a 值分别可达 303 K 时的 41.774、32.072、38.457 cm3·g-1，随着 R 的增大而增大。研究煤泥对 CO2 吸附性能的影响，为后续储能材料的制备提供了理论依据，对 CO2 的安全、高效、经济捕集封存，缓解严峻的环境形势，实现双碳目标具有重要意义。
