Potential, Efficiency, and Leakage Risk of CO2 Sequestration in Coal: A Review

作者：Xueliang Liu, Baoxin Zhang, Xuehai Fu, Jielin Lu, Manli Huang, Fanhua Zeng · 发表于：Processes · 年份：2025 · DOI：10.3390/pr13061680 · 被引用次数：8 · 研究领域：Coal Properties and Utilization、Geomechanics and Mining Engineering、CO2 Sequestration and Geologic Interactions

CO2 sequestration in coal is effective for reducing carbon emissions, but related projects have encountered challenges in sustained CO2 injection, highlighting the need for a comprehensive understanding of CO2 sequestration in coal. This study reviews variations in the properties of coal/rock during/after CO2 injection, demonstrating the potential and stability of CO2 sequestration in coal. The coal with a high VL-CO2/VL-CH4 is accompanied by high CO2 sequestration capacity. The matrix swelling and acid corrosion restrict CO2 sequestration efficiency, which can be enhanced by employing coatings and increasing permeability. Long-term CO2–water–rock interactions weaken the integrity of coal/caprocks and decrease the adsorption capacity of coal, leading to the CO2 leakage risk. Three issues are critical in future studies: (1) Increasing CO2 adsorption capacity. (2) Establishing optimal approaches to enhance CO2 injection efficiency. (3) Accurately predicting variations in the adsorption capacity of deep coal and the integrity of coal/caprocks during long-term CO2–water–rock interactions. This review provides foundations for formulating CO2 sequestration strategies in coal.