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Mechanical property alterations across coal matrix due to water-CO2 treatments: A micro-to-nano scale experimental study

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  • Liu, Ang
  • Liu, Shimin

Abstract

CO2 sequestration in geological coal formations is a promising pathway to store a huge amount of CO2 due to a strong CO2 affinity on coal. It has been reported that CO2 sorption can cause a strength reduction of coals. However, the mechanism-based understandings of CO2-coal interactions induced alterations are still challenging in micro-to-nano scale. We conducted the combined grid-based nanoindentation tests and FESEM-EDS analyses to understand and quantify the mechanical property variations and distributions of coals in micro- or nano-scale due to its mineral and structural variations. We also quantified the mechanical property alterations induced by gaseous CO2, ScCO2, and ScCO2-water mixture treatments at different treating durations. The combined results from the FESEM-EDS and XRD confirmed that the heterogeneity of two tested coal is prevailing at micro-to-nano scale and the corresponding mechanical properties are composition- and microstructure-dependent. The mechanical properties of coals can be altered by gaseous CO2, ScCO2, and ScCO2-water mixture treatments primarily due to the organic carbon-CO2 interactions and water hydration effects in wetted coals, or potentially due to the dissolution and precipitation of minerals occurred in fluid environment typically under the ScCO2-water treatment condition.

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  • Liu, Ang & Liu, Shimin, 2022. "Mechanical property alterations across coal matrix due to water-CO2 treatments: A micro-to-nano scale experimental study," Energy, Elsevier, vol. 248(C).
    • Handle: RePEc:eee:energy:v:248:y:2022:i:c:s0360544222004789
    DOI: 10.1016/j.energy.2022.123575
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    References listed on IDEAS

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    3. Wang, Ziwei & Qin, Yong & Shen, Jian & Li, Teng & Zhang, Xiaoyang & Cai, Ying, 2022. "A novel permeability prediction model for coal based on dynamic transformation of pores in multiple scales," Energy, Elsevier, vol. 257(C).

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