Journal
ENERGY
Volume 220, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.119806
Keywords
CO2 storage; Mineral alterations; Supercritical pressure; Zululand basin
Categories
Funding
- South African Centre for Carbon Dioxide Capture and Storage (SACCCS)
- SACCCS
Ask authors/readers for more resources
Carbon dioxide (CO2) sequestration in geological formations is an effective solution for reducing CO2 emissions, with significant physical and chemical structural changes observed in samples post-treatment, including mineral alterations, dissolution of organic components, surface chemistry alterations, and increases in pore volume and CO2 adsorption capacity.
Carbon dioxide (CO2) sequestration in geological formations is a viable solution for ensuring coal-based energy supply whilst reducing CO2 emissions. The variation in the microstructure and composition of geological formations before and after CO2 storage plays a significant role in CO2 sequestration. Three core samples obtained from the Zululand Basin in South Africa were exposed to supercritical CO2 (ScCO2) in the presence of water under typical hydrothermal conditions (175 bar, 70 degrees C) for up to 2 months. The samples were characterized preand post-treatment using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), low pressure nitrogen (N-2) adsorption and low pressure CO2 adsorption. Physical and chemical structural changes were observed in all three samples after treatment, to varying degrees. Mineral alterations were observed in the three samples, including plagioclase and calcite dissolution/precipitation and quartz composition changes. Dissolution of organic components and surface chemistry alterations were found in two of the core samples. Increases in pore volume, surface area and CO2 adsorption capacity were observed in all studied samples after CO2 treatment. (c) 2021 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available