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The Influence of Coal Microstructure on the Thermodynamic Behavior of Water Vapor Adsorption in Coal.

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Title: The Influence of Coal Microstructure on the Thermodynamic Behavior of Water Vapor Adsorption in Coal.
Authors: Zhou, Caiwen1 (AUTHOR), Li, Haijian1,2 (AUTHOR) haijianlee@xju.edu.cn, Dang, Long3 (AUTHOR)
Source: Energies (19961073). Feb2026, Vol. 19 Issue 4, p898. 31p.
Subject Terms: *Porosity, *Thermodynamics, *Physisorption, *Gas absorption & adsorption, *Hydrophilic compounds, Fractal dimensions
Abstract: The presence of water during coalbed methane development significantly affects gas adsorption and migration. However, the factors governing primary and secondary water vapor adsorption amounts and adsorption heats remain unclear. In this study, the chemical and pore structures of five coals with different ranks were characterized, and water vapor adsorption experiments were conducted at three temperatures. The variation patterns of water vapor adsorption and heat in coal were investigated, along with the factors influencing these parameters. More importantly, the factors affecting the primary and secondary adsorption amounts were examined, as well as the primary and secondary adsorption heats. The results indicate that the hydrophilic/hydrophobic properties of coal surfaces and the micropore fractal dimension are the primary factors influencing the amount of water vapor adsorption in coal. The oxygen-containing functional group structural parameter 'C' ranges from 0.22 to 0.55, and the micropore fractal dimension ranges from 2.26695 to 2.41057. The micropore fractal dimension exhibits the strongest influence on secondary adsorption (r = 0.90). The primary and secondary adsorption heats range from 30 to 73 kJ/mol and 34 to 47 kJ/mol, respectively. The initial adsorption heat of water vapor in coal exhibits a strong positive relationship with both the specific surface area (57.24–160.06 m2/g) and volume (0.0184–0.0515 cm3/g) of micropores, with r > 0.90. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 191973318
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: The Influence of Coal Microstructure on the Thermodynamic Behavior of Water Vapor Adsorption in Coal.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Zhou%2C+Caiwen%22">Zhou, Caiwen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Haijian%22">Li, Haijian</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> haijianlee@xju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Dang%2C+Long%22">Dang, Long</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Feb2026, Vol. 19 Issue 4, p898. 31p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Porosity%22">Porosity</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Physisorption%22">Physisorption</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas+absorption+%26+adsorption%22">Gas absorption & adsorption</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrophilic+compounds%22">Hydrophilic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Fractal+dimensions%22">Fractal dimensions</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The presence of water during coalbed methane development significantly affects gas adsorption and migration. However, the factors governing primary and secondary water vapor adsorption amounts and adsorption heats remain unclear. In this study, the chemical and pore structures of five coals with different ranks were characterized, and water vapor adsorption experiments were conducted at three temperatures. The variation patterns of water vapor adsorption and heat in coal were investigated, along with the factors influencing these parameters. More importantly, the factors affecting the primary and secondary adsorption amounts were examined, as well as the primary and secondary adsorption heats. The results indicate that the hydrophilic/hydrophobic properties of coal surfaces and the micropore fractal dimension are the primary factors influencing the amount of water vapor adsorption in coal. The oxygen-containing functional group structural parameter 'C' ranges from 0.22 to 0.55, and the micropore fractal dimension ranges from 2.26695 to 2.41057. The micropore fractal dimension exhibits the strongest influence on secondary adsorption (r = 0.90). The primary and secondary adsorption heats range from 30 to 73 kJ/mol and 34 to 47 kJ/mol, respectively. The initial adsorption heat of water vapor in coal exhibits a strong positive relationship with both the specific surface area (57.24–160.06 m2/g) and volume (0.0184–0.0515 cm3/g) of micropores, with r > 0.90. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
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        Value: 10.3390/en19040898
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      – Code: eng
        Text: English
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        PageCount: 31
        StartPage: 898
    Subjects:
      – SubjectFull: Porosity
        Type: general
      – SubjectFull: Thermodynamics
        Type: general
      – SubjectFull: Physisorption
        Type: general
      – SubjectFull: Gas absorption & adsorption
        Type: general
      – SubjectFull: Hydrophilic compounds
        Type: general
      – SubjectFull: Fractal dimensions
        Type: general
    Titles:
      – TitleFull: The Influence of Coal Microstructure on the Thermodynamic Behavior of Water Vapor Adsorption in Coal.
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            NameFull: Zhou, Caiwen
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            NameFull: Li, Haijian
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            NameFull: Dang, Long
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            – D: 15
              M: 02
              Text: Feb2026
              Type: published
              Y: 2026
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              Value: 19
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            – TitleFull: Energies (19961073)
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