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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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    1. Chaturvedi, Krishna Raghav & Narukulla, Ramesh & Amani, Mahmood & Sharma, Tushar, 2021. "Experimental investigations to evaluate surfactant role on absorption capacity of nanofluid for CO2 utilization in sustainable crude mobilization," Energy, Elsevier, vol. 225(C).
    2. Perera, M.S.A. & Ranjith, P.G. & Viete, D.R., 2013. "Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin," Applied Energy, Elsevier, vol. 110(C), pages 73-81.
    3. Chaturvedi, Krishna Raghav & Trivedi, Japan & Sharma, Tushar, 2020. "Single-step silica nanofluid for improved carbon dioxide flow and reduced formation damage in porous media for carbon utilization," Energy, Elsevier, vol. 197(C).
    4. Shimin Liu & Yi Wang & Satya Harpalani, 2016. "Anisotropy characteristics of coal shrinkage/swelling and its impact on coal permeability evolution with CO 2 injection," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(5), pages 615-632, October.
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    Cited by:

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    2. Yongzan, Wen & Guanhua, Ni & Xinyue, Zhang & Yicheng, Zheng & Gang, Wang & Zhenyang, Wang & Qiming, Huang, 2023. "Fine characterization of pore structure of acidified anthracite based on liquid intrusion method and Micro-CT," Energy, Elsevier, vol. 263(PA).
    3. Meng, Junqing & Lyu, Chunhui & Wang, Lijuan & Wang, Jie & Nie, Baisheng & Lyu, Yingpei & Cao, Zihao, 2023. "Effect of cyclic load on mechanical properties and failure mechanisms of different rank coals," Energy, Elsevier, vol. 278(PB).

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