Abstract
In this work, the potential of two-dimensional equations of state (2D) was explored in terms of high pressure adsorption prediction and parametric analysis. To attain this objective, firstly, low pressure experimental data for CO2 and CH4 adsorption on NaY zeolite and babassu activated carbon were correlated with two-dimensional equations of state of van der Waals (2D vdW), Peng-Robinson (2D PR), Zhou et al. (2D ZGR) and 2D ZGRm (m as a fitted paramter). Then, high pressure isotherms were predicted for the same systems and compared to experimental data. Thus, a parametric analysis was made varying 2D ZGRm parameters: adsorbate-adsorbate interaction (a2); co-area (b2); Henry's Law constant (K); heterogeneity parameter (m); adsorbent specific area (A). Results indicate that these parameters present a critical value at a given pressure that separates homogeneous and heterogeneous adsorbed phases. Depending on the set of parameters applied, different types of isotherms can be described by 2D ZGRm. Therefore, it was verified that 2D EOS have the potential to be applied for both low pressure characterization of adsorbent materials and high-pressure adsorption processes.
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