Adsorption equilibria of pure vapors and their binary mixtures on activated carbon Part I. Single-component equilibria

Evaluating mixture adsorption models using molecular simulation

“…Moon and Tien took the analysis a step further and proposed that matching the sites of different adsorbates based on a site‐matching criteria that accounts for correlation of the adsorption of different components on the same site. Eiden and Schlünder applied a similar approach to the analysis of dichloromethane and benzene adsorption on activated carbons. Calling the approach multiphase IAST, they assumed a pore filling mechanism and applied IAST to separate sites based on a difference in saturation volumes between components.…”

“…This difficulty is mitigated in practice by the use of a model, such as ideal adsorbed solution theory (IAST), to interpolate mixture data from pure‐component data, which is simpler to collect . Although IAST has been shown to provide good predictions for a wide variety of fluid‐adsorbent systems, there are numerous cases where it has been shown that the predictions are inaccurate . The IAST model assumes ideal behavior of the adsorbed phase and that all components have access to the same uniform surface.…”

“…The IAST model assumes ideal behavior of the adsorbed phase and that all components have access to the same uniform surface. This second assumption is frequently violated in practical adsorbents, and variety of approaches have been proposed to correct for the inaccuracies it introduces, which will be discussed in more detail later . Recent efforts in synthesizing and predicting new materials have led to a plethora of potential new adsorbents, including metal–organic frameworks (MOFs), zeolitic imidazolate frameworks (ZIFs), and novel zeolites.…”

Redistribution of adsorbed VOCs in activated carbon under electrothermal desorption

“…Considering that the pore-size boundary is related to the change in the adsorption mechanism, the type of the pore can be determined from the terminal point in the adsorption-desorption hysteresis loop. Eiden and Schliinder (1990) studied this phenomenon and introduced a new parameter, AGr, to denote the chemical potential at this phase transition point. According to their study, A,, was found to depend only on the molecular size of the adsorbate, but was independent of the adsorbent property.…”

“…Therefore, no VOC will be condensed for this kind of adsorbent. However, when a "weak" adsorbent is employed (Eiden and Schliinder, 1990), a somewhat different result is obtained. As shown in Figure 9b, the condition indicated by the Dubinin equation under an adsorption amount of 0.40 mL VOC/g A.C. is equivalent to the Kelvin equation at a pore diameter of 3 nm.…”