TY - JOUR

T1 - A review of influencing factors and study methods of carbon capture and storage (CCS) potential in coals

AU - Safaei Farouji, Majid

AU - Misch, David

AU - Sachsenhofer, Reinhard

N1 - Publisher Copyright: © 2023 Elsevier B.V.

PY - 2023/9/1

Y1 - 2023/9/1

N2 - Geological formations are suitable locations for CO2 sequestration, and among them, coals are excellent targets because of their nanoporous structure, which leads to a high gas adsorption capacity. The first part of this review summarizes the most important influencing factors on coal pore structure and resulting CO2 storage capacity. In the second part, the most commonly applied methods for pore structural characterization are introduced and discussed in the light of the challenges that arise from the complex and heterogeneous nature of coal microstructures. In general, it is recommended to use an array of complementary methods for microstructural characterization since pores in coals span over a wide size range from <1 nm to >1 mm. Coals furthermore show dual porosity (matrix pores and fractures) in most cases. Numerous factors may influence the occurrence of these pore types as well as the gas adsorption capacity, including formation temperature, coal rank, moisture content, swelling, maceral composition, ash content, stress state, type of gas, and gas pressure. All of these factors must be taken into account in order to optimize planned CO2 storage operations.

AB - Geological formations are suitable locations for CO2 sequestration, and among them, coals are excellent targets because of their nanoporous structure, which leads to a high gas adsorption capacity. The first part of this review summarizes the most important influencing factors on coal pore structure and resulting CO2 storage capacity. In the second part, the most commonly applied methods for pore structural characterization are introduced and discussed in the light of the challenges that arise from the complex and heterogeneous nature of coal microstructures. In general, it is recommended to use an array of complementary methods for microstructural characterization since pores in coals span over a wide size range from <1 nm to >1 mm. Coals furthermore show dual porosity (matrix pores and fractures) in most cases. Numerous factors may influence the occurrence of these pore types as well as the gas adsorption capacity, including formation temperature, coal rank, moisture content, swelling, maceral composition, ash content, stress state, type of gas, and gas pressure. All of these factors must be taken into account in order to optimize planned CO2 storage operations.

KW - Carbon capture and storage (CCS)

KW - Coal

KW - Gas adsorption

KW - Global warming

KW - Pore structure

UR - http://www.scopus.com/inward/record.url?scp=85169796433&partnerID=8YFLogxK

U2 - 10.1016/j.coal.2023.104351

DO - 10.1016/j.coal.2023.104351

M3 - Review article

AN - SCOPUS:85169796433

VL - 277.2023

JO - International journal of coal geology

JF - International journal of coal geology

SN - 0166-5162

IS - 1 September

M1 - 104351

ER -