Hydrogen diffusion in coal: Implications for hydrogen geo‐storage

Results show that H₂ adsorption rate, and consequently [Formula: see text] , increases by temperature. [Formula: see text] values are one order of magnitude larger than the equivalent [Formula: see text] values for the whole studied temperature range 20-60 °C. [Formula: see text] / [Formula: see text] also shows an increasing trend versus temperature. CO₂ adsorption capacity at equilibrium pressure is about 5 times higher than that of H₂ in all studied temperatures. Both H₂ and CO₂ adsorption capacities, at equilibrium pressure, slightly decrease as temperature rises.