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Hydrogen diffusion in coal: Implications for hydrogen geo-storage.

Alireza Keshavarz1, Hussein Abid2, Muhammad Ali3

  • 1Petroleum Engineering Discipline, School of Engineering, Edith Cowan University, 270 Joondalup Dr, Joondalup, 6027 WA, Australia; Centre for Sustainable Energy and Resources, Edith Cowan University, 270 Joondalup Dr, Joondalup, 6027, WA, Australia.

Journal of Colloid and Interface Science
|November 8, 2021
PubMed
Summary
This summary is machine-generated.

Hydrogen diffusion in coal is crucial for underground hydrogen storage. This study found that hydrogen diffusion rates in coal increase with temperature, suggesting better storage potential at higher temperatures.

Keywords:
CoalDeep coal seamsHydrogen adsorption rateHydrogen diffusionHydrogen geo-storage

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Area of Science:

  • Geosciences
  • Energy Storage
  • Materials Science

Background:

  • Large-scale hydrogen storage is essential for a future hydrogen economy.
  • Coal seams are promising geological formations for hydrogen storage due to their porous structure.
  • Fundamental data on hydrogen diffusion in coal is currently limited.

Purpose of the Study:

  • To investigate hydrogen diffusion rates in Australian anthracite coal.
  • To determine the effect of temperature on hydrogen adsorption and diffusion in coal.
  • To compare hydrogen adsorption with carbon dioxide adsorption in coal.

Main Methods:

  • Measured hydrogen adsorption rates in Australian anthracite coal at 20°C, 30°C, 45°C, and 60°C.
  • Calculated the hydrogen diffusion coefficient at each temperature under isothermal conditions (~13 bar equilibrium pressure).
  • Measured carbon dioxide adsorption rates for comparison under similar conditions.

Main Results:

  • Hydrogen adsorption rate and diffusion coefficient increase with temperature (20-60°C).
  • Hydrogen diffusion coefficients are approximately one order of magnitude higher than carbon dioxide diffusion coefficients.
  • Carbon dioxide exhibits higher adsorption capacity (~5 times) than hydrogen at equilibrium pressure.
  • Both hydrogen and carbon dioxide adsorption capacities slightly decrease with increasing temperature.

Conclusions:

  • Temperature positively influences hydrogen diffusion in coal, enhancing storage potential.
  • Coal's capacity for hydrogen storage is significant, though lower than for carbon dioxide.
  • Understanding hydrogen diffusion dynamics is key for optimizing underground hydrogen storage in coal seams.