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Related Experiment Videos

Optimum conditions for adsorptive storage.

Suresh K Bhatia1, Alan L Myers

  • 1Division of Chemical Engineering, University of Queensland, Brisbane, QLD 4072 Australia. sureshb@cheque.uq.edu.au

Langmuir : the ACS Journal of Surfaces and Colloids
|February 8, 2006
PubMed
Summary

Finding the best gas storage adsorbent requires optimizing adsorption enthalpy and operating temperature. Homogeneous materials are crucial for maximizing gas delivery, especially for methane storage.

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Pure Hydrogen and Methane Permeation in Carbon-Based Nanoporous Membranes: Adsorption Isotherms and Permeation Experiments.

Membranes·2024

Area of Science:

  • Materials Science
  • Thermodynamics
  • Chemical Engineering

Background:

  • Porous adsorbents like activated carbon and carbon nanotubes are investigated for gas storage.
  • The adsorption-desorption cycle is thermodynamically analyzed for system efficiency.

Purpose of the Study:

  • To establish objective criteria for identifying optimal adsorbents for maximized gas delivery.
  • To determine ideal thermodynamic parameters for hydrogen and methane storage.

Main Methods:

  • Thermodynamic analysis of the adsorption-desorption cycle.
  • Extensive Monte Carlo simulations using slit pore and atomistic models.
  • Validation with experimental data from scientific literature.

Main Results:

  • Optimal adsorption enthalpy change for hydrogen is 15.1 kJ/mol at 115 K, and for methane is 18.8 kJ/mol at 254 K.
  • Homogeneous adsorbents maximize gas delivery; heterogeneity is detrimental for methane and offers minimal gains for hydrogen.
  • Carbon nanotubes show no significant advantage over activated carbons for hydrogen or methane storage.

Conclusions:

  • Adsorbent homogeneity and specific enthalpy changes are key for efficient gas storage.
  • Thermodynamic criteria guide the development of superior adsorbents.
  • Current carbon-based materials require specific operating conditions for optimal performance.

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