COMPARISON OF MODELS ON THE PREDICTION OF BINARY EQUILIBRIUM DATA OF ACTIVATED CARBONS

A pure-component equilibrium adsorption isotherm of methane, ethane, p ropane, and CO2 at different temperatures and the binary adsorption da ta of methane with the other three species measured at 500 torr (66.7 kPa) and temperatures of 273 K and 303 K are presented and discussed T hese measurements were carried out on three nutshell-derived KOH chemi cally activated carbon (AC) samples and one commercial activated carbo n. The binary adsorption data of another commercial AC (Nuxit-al) from the literature are also used for comparison purposes. The single and binary experimental data were applied to six models: IAST, loading-dep endent isosteric heat, micropore-size distribution (MPSD), energy dist ribution (ED), extended Langmuir, and extended Sips models. The models were found to describe the experimental data of the commercial ACs wi th a reasonably good accuracy but only the model assuming isosteric he ar as a function of loading could reasonably predict the data of KOH c hemically activated carbons.