Abstract
The adsorption isotherms of hydrogen on super activated carbon were measured systematically, covering a temperature range of 93–293 K at 20 K intervals and pressures up to 7 MPa. All the experimental data were linearized by adopting the coordinates ln ln(n) vs 1/(ln P). The results indicate that the adsorption limit (Plim, nlim) exists virtually at high pressure and has a certain physical meaning. Based on the adsorption limit, further analyses were carried out by modeling the adsorption isotherms in the coordinates ln(nlim/n) vs ln(RT(ln(Plim/P) and a linear comprehensive adsorption model was proposed in the form nlim=n·exp(ψT+λ|T−c|)β·[RT ln(PlimP)]b which can predict the adsorption isotherm of hydrogen on activated carbon in supercritical conditions.
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