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A laboratory study of supercritical CO2 adsorption on cap rocks in the geological storage conditions


In the present study, various cap rocks have been experimentally reacted in water with supercritical CO2 in geological storage conditions (P = 8 × 106 Pa and T = 80 °C) for 25 days. To characterize the potential CO2–water–rock interactions, an experimental setup has been built to provide additional information concerning the effects of structure, thermal and surface characteristics changes due to CO2 injection with cap rocks. In addition, CO2 adsorption capacities of different materials (i.e., clay evaporate and sandstone) are measured. These samples were characterized by XRD technique. The BET specific surface area was determined by nitrogen isotherms. In addition, thermal characteristics of untreated adsorbents were analyzed via TGA method and topography surfaces are identified by Scanning Electron Microscope (SEM). Taking into account pressure and temperature, the physical as well as chemical mechanisms of CO2 retention were determined. Isotherm change profiles of samples for relative pressure range indicate clearly that CO2 was adsorbed in different quantities. In accordance with the X-ray diffraction, a crystalline phase was formed due to the carbonic acid attack and precipitation of some carbonate.

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Correspondence to Hedi Jedli.

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Jedli, H., Jbara, A., Hedfi, H. et al. A laboratory study of supercritical CO2 adsorption on cap rocks in the geological storage conditions. Appl. Phys. A 123, 254 (2017).

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  • Sandstone
  • Kaolinite
  • Sandstone Sample
  • Fibrous Morphology
  • Mineral Trapping