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Modeling spreading-pressure-dependent binary gas coadsorption equilibria using gravimetric data.

D Tondeur1, F Yu, K Bonnot

  • 1Laboratoire des Sciences du Génie Chimique-CNRS, ENSIC-INPL, 1 rue Grandville, 54000 Nancy, France. tondeur@ensic.inpl-nancy.fr

Journal of Colloid and Interface Science
|August 10, 2005
PubMed
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This study presents a new method for creating nonideal coadsorption models using gravimetric data. The approach ensures thermodynamic consistency and accurately predicts gas mixture adsorption behavior.

Area of Science:

  • Physical Chemistry
  • Adsorption Science
  • Thermodynamics

Background:

  • Developing accurate nonideal coadsorption models is crucial for understanding gas mixture behavior on surfaces.
  • Existing models often lack thermodynamic consistency or require extensive experimental data.
  • Gravimetric measurements offer a direct way to quantify adsorbed amounts.

Purpose of the Study:

  • To develop a thermodynamically consistent approach for building nonideal coadsorption models.
  • To determine model parameters from limited, simple gravimetric measurements.
  • To incorporate the effects of pressure and spreading pressure into coadsorption models.

Main Methods:

  • Utilizing nonideal adsorbed solution theory with activity coefficients dependent on spreading pressure.

Related Experiment Videos

  • Employing an original form of the excess Gibbs energy of mixing.
  • Developing an analytical framework to relate model parameters to experimental data, including single-component isotherms and binary gravimetric curves at different pressures.

    • Main Results:

    • A quasi-analytical and unique method for determining the four parameters of the coadsorption model.
    • Demonstrated applicability using the coadsorption of carbon dioxide (CO2) and methane (CH4) on activated carbon.
    • Validation using both incremental gravimetry and batch-type equilibration measurements.

    Conclusions:

    • The proposed method provides a robust and efficient way to build nonideal coadsorption models.
    • Thermodynamic consistency is achieved by integrating activity coefficients and excess Gibbs energy.
    • The method requires only total adsorbed mass data, simplifying experimental requirements.