Mechanical Property Alterations Across Coal Matrix Due to Water-CO2 Treatments: A Micro-to-Nano Scale Experimental Study

Details

• Personal Author:
  Liu A ; Liu S
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Carbon Dioxide Occupational Health Safety
• Keywords:
  Author Keywords: CO2 Adsorption Carbon Dioxide Coal Mines FESEM-EDS Geotechnical Engineering Heterogeneity Mechanical Properties Testing Nanoindentation Nanoscale Scanning Electron Microscopy Sorption Supercritical CO2 X-ray Diffraction

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• ISSN:
  0360-5442
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  248
• NIOSHTIC Number:
  nn:20067948
• Citation:
  Energy 2022 Jun; 248:123575
• Contact Point Address:
  Shimin Liu, Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, PA, 16802, USA
• Email:
  szl3@psu.edu
• CAS Registry Number:
  Carbon dioxide (CAS RN 124-38-9)
• Federal Fiscal Year:
  2022
• Performing Organization:
  Pennsylvania State University
• Peer Reviewed:
  True
• Start Date:
  20190827
• Source Full Name:
  Energy
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:8dbce2998eb35b58a53e2c47d5a438bd25f03162dbfe90a31256411392695abb8a8f2935aaf0f72ea619ada17082e74c851ee311a70e56064b71944d3eaf9836
• Download URL:
  https://stacks.cdc.gov/view/cdc/230181/cdc_230181_DS1.pdf
• File Type:
  [PDF - 14.91 MB ]