Adsorption equilibrium of the mixture CH₄ + N₂ + H₂ on activated carbon

Adsorption equilibrium data of the mixture CH₄ + N₂ + H₂ on activated carbon JX101 were collected with a dynamic method for the temperature range 283 K to 313 K. Since the critical temperature of the components is much lower than the temperature tested, this set of data was used to test the applicability of the available prediction models for the condition of above-critical temperatures. Some models rely on the adsorption data of pure components; therefore, the adsorption isotherms of pure CH₄, N ₂, and H₂ on the same carbon were also collected. Six prediction models were tested. They are the extended Langmuir (EL) model, the loading ratio correlation (LRC) model, the ideal adsorption solution theory (LAST), the Flory-Huggins vacancy solution model (FHVSM), the model based on micropore size distribution and the extended Langmuir equation (MPSD-EL), and the model based on micropore size distribution and the ideal adsorption solution theory (MPSD-IAST). The performance of a model was valued with the average relative discrepancy between the experimental data and the model-predicted values.