Experimental study of hydrogen adsorption on coal with different ranks: Considerations for hydrogen geo-storage
Longinos S.N.
November 2025Elsevier B.V.
Geoenergy Science and Engineering
2025#254
To evaluate the hydrogen storage potential of four coal specimens of different rankings, from four different basins and three different countries. We measured hydrogen adsorption on them at high pressures (30, 60, 90 and 120 bars) and high temperatures (30 °C, 40 °C, 50 °C and 60 °C). Regardless of coal rank, the excess adsorption capacity rose with increasing pressure but fell with rising temperature. For the anthracite coal, the maximum hydrogen adsorption measured average value at 30 °C and 120 pressure was 0.83 mol/kg, for bitumen average value was 0.72 mol/kg, for sub-bitumen average value was 0.64 mol/kg and for lignite average value was 0.45, hence H2 hydrogen adsorption followed the trend: anthracite > bitumen > sub-bitumen > lignite. The biggest difference in hydrogen adsorption across various coal types was found between lignite and anthracite at 120 bars and 30 °C, hitting a remarkable 84.44 %. On the flip side, the smallest variation, just 5.56 %, was noted between lignite and sub-bituminous coal at 30 bars and 50 °C. The Langmuir adsorption isotherm model indicated that bitumen and sub-bitumen exhibit favourable characteristics for geological storage; however, they are marginally less effective than anthracite due to lower qmax values. Lignite, possessing the lowest qmax, demonstrates limited potential for large-scale hydrogen storage.
Adsorption , Coal , Hydrogen , Rank , Storage
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School of Mining and Geosciences, Department of Petroleum Engineering, Nazarbayev University, Astana, Kazakhstan
School of Mining and Geosciences
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