Page 174 - Gas Adsorption Equilibria

160 Chapter 3

Hence we have from (3.42-3.49)

As the Gibbs excess mass adsorbed of component i is

we finally get in view of (3.50) and (3.42, 3.46):

with the molar mass of the sorptive gas in the adsorption equilibrium state

The mass concentrations needed in eq. (3.52) and the molar
concentrations of the sorptive gas measured at the gas chromatograph
are interrelated by the equations

From the Gibbs excess masses (3.52), the absolute masses adsorbed
i = 1...N) can be calculated using eqs. (2.31), (2.32) already given in
Chap. 2.

Also the selectivities of any two components i, k of the gas adsorption
system can be calculated from eq. (2.33), Sect. 4.2 of Chap. 2 as adsorbate’s
Gibbs excess molar concentrations