Page 200 - Gas Adsorption Equilibria

186 Chapter 4

with the real gas factor

the microbalance equation

with the density of the sorptive gas given by

and its volume being

In Eq. (4.1) the masses of the gas components initially prepared in
the storage vessel can be calculated from the EOS as

Here is the (known) molar concentration of component i = 1, 2 of the gas,
the molar mass of component i = 1,2, the pressure in the storage vessel
prior to the adsorption experiment, its volume, R is the universal gas
constant and

is the compressibility factor of the sorptive gas in the storage vessel. The
adsorption chamber is assumed to be evacuated at the beginning of the
experiment.

The microbalance recording is an experimental quantity comprising the
numerical results of four different measurements performed on the
microbalance. These are