Virial Description of Two-Component Adsorption on Homogeneous and Heterogeneous Surfaces

Abstract

The two-dimensional virial equation of state is used to describe the adsorbed phase on both homogeneous and heterogeneous surfaces. Heterogeneity is modeled by assuming that the adsorbent surface is composed of two patches. The adsorbed phase is assumed to be completely mobile, and the same virial coefficients represent adsorbate−adsorbate interactions on both patches. Experimental data for highly nonideal systems are accurately correlated using the two-patch model. A predictive approach is proposed for deducing the mixture coefficients from pure component parameters. The approach works reasonably well in predicting binary adsorption equilibria for simple systems.

Activated carbon for hydrogen purification by pressure swing adsorption: Multicomponent breakthrough curves and PSA performance

“…The predictions for multicomponent fixed-bed experiments of H 2 -CO 2 , H 2 -CO 2 -CO and H 2 -CO 2 -CH 4 -CO-N 2 were made applying the extended Virial isotherm model (Kiselev, 1971;Barrer, 1981;Taqvi and LeVan, 1997) using the parameters previously obtained (2) pressure equalization-depressurization step; (3) counter-current blowdown step; (4) counter-current purge step with hydrogen; (5) pressure equalization-pressurization step; (6) counter-current pressurization step with hydrogen; Cycle B: (1) co-current feed step; (2) first, (3) second and (4) third pressure equalization-depressurization steps; (5) counter-current blowdown step; (6) counter-current purge step with hydrogen; (7) third, (8) second and (9) first pressure equalization-pressurization steps; and (10) counter-current pressurization step with hydrogen.…”

Cooperative and Competitive Adsorption of Ethylene, Ethane, Nitrogen and Argon on Graphitized Carbon Black and in Slit Pores

“…One of the earliest theoretical studies on mixture adsorption is the Ideal Adsorption Solution Theory (IAST) of Myers and Prausnitz (1965). This approach as well as many later theoretical studies have been used by many researchers for studying adsorption equilibria of mixtures (for example, LeVan and Vermeulen, 1981;Moon and Tien, 1987;Russel andLeVan, 1996, 1997;Taqvi and LeVan, 1997;Staudt et al, 1998;Keller et al, 1999). Tabulation of adsorption mixture data, mostly on porous activated carbon and other porous materials, are also available (Reich et al, 1980;Costa et al, 1981Costa et al, , 1989Kaul, 1984;Valenzuela and Myers, 1989).…”

Effect of Gas Recycling on the Performance of a Moving Bed Temperature-Swing (MBTSA) Process for CO2 Capture in a Coal Fired Power Plant Context

“…The adsorption equilibrium of the gases onto the solid is described by the Virial adsorption model, which presents the following extension of single component equilibrium to predict multi component systems [13][14][15][16]:…”