By Duong D. Do

Covers issues of equilibria & kinetics of adsorption in porous media. even though gasoline part structures are rather thought of, the foundations & thoughts are acceptable to liquid part platforms to boot. CD-ROM incorporated.

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Extra resources for Adsorption analysis: Equilibria and kinetics (Series on Chem. Engineering)

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1-1) and the magnitude of this fluctuation is larger than the thermal energy of a molecule (kT), and hence the troughs of the energy fluctuation are acting as the adsorption sites. If the distance between the two neighboring troughs is much larger than the diameter of the adsorbate molecule, the adsorption process is called localised and each adsorbate molecule will occupy one site. Also, the depth of all troughs of the ideal surface are the same, that is the adsorption heat released upon adsorption on each site is the same no matter what the loading is.

2 VSM-Flory-Huggin Model The VSM-W isotherm equation is a four parameters model (Alv , Avl, K and C^). The pairwise interaction constants Alv and Avl have been found to be highly correlated. To avoid this problem, Cochran et al. 7-6b) with a, and av being molar areas of the adsorbed species and the vacancy, respectively. 3-13), the adsorption isotherm equation is: J e = ciL (2 7 7) - " This equation has one less parameter than eq. 7-5) which uses the Wilson equation for activity coefficient. Since the molar areas of the adsorbate (a^ and the vacancy (av) are positive, the parameter a l v must be greater than - 1.

In this theme the following van der Waals equation can be used: - C T o) = R g T (2-3"26) With this equation of state, the isotherm equation obtained is: bp = ir^ e x p (ir^) exp (~ c0> (2 3 27) -" where b =b . 28) where z is the coordination number (usually taken as 4 or 6 depending on the packing of molecules), and w is the interaction energy between adsorbed molecules. A positive w means attraction between adsorbed species and a negative value means repulsion, that is the apparent affinity is increased with loading when there is attraction between adsorbed species, and it is decreased with loading when there is repulsion among the adsorbed species.

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