, Volume 19, Issue 1, pp 131-142
Date: 03 Oct 2012

On the description of isotherms of CH4 and C2H4 adsorption on graphite from subcritical to supercritical conditions

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Abstract

Different potential models for methane and ethylene are tested for their suitability for the description of bulk phase behavior, including coexistence, and adsorption on a graphite surface under sub- and super-critical conditions using GCMC simulation. Under sub-critical conditions, those intermolecular potential models that describe correctly the vapor–liquid equilibria were found to be adequate for the description of surface adsorption. These potential models can also give a good account of adsorption under supercritical conditions or near-critical conditions, provided the experimental data (in terms of excess) are correctly obtained with the reliably determined void volume as illustrated in this paper with methane adsorption.