Adsorption equilibrium of hydrogen on activated carbon YK-1

The adsorption equilibrium of hydrogen on the coconut shell activated carbon YK-1 was analyzed based on the adsorption data volumetrically measured over a temperature-pressure range respectively within 113-293 K and 0-12.5 MPa.Isosteric heats of hydrogen adsorption at four adsorption amounts and limit values under zero surface coverage were determined by adsorption isosteres and the Henry plot of the adsorption data within 10% surface coverage,respectively.A lattice theory based Ono-Kondo model was applied for model study of the adsorption data,linear regression of the equation was carried out to determine the maximum adsorption capacity,the adsorption potential and the correlating parameter.The results show that the isosteric heat of adsorption varies evenly with the adsorption amount,the mean and limit values are respectively 4.64 kJ/mol and 5.37 kJ/mol;the model can much accurately predict the isotherms,and the maximum adsorption capacity decreases with temperature with its value smaller than that of the liquid hydrogen.The adsorptive performance of hydrogen can be enhanced on an activated carbon by increasing its specific surface area and the micropore volume as well as properly lowering down the temperature of the storage system.