Page 24 - Gas Adsorption Equilibria

Introduction 9

b) combining two or more of the measurement methods mentioned above for
single gas component systems.

Indeed, procedures (b) open various interesting possibilities to measure
binary coadsorption equilibria and to design respective instruments for fully
automated measurements, cp. for example Chap. 4, Fig. 4.11b. To get an
overview, the various possibilities of coadsorption measurements by
combining single component methods are sketched in Table 0.2. The numbers
in the upper right portion of this matrix scheme indicate the number of
components in the gas mixture which can be determined by the respective
method. The numbers in the lower left portion of the matrix give the Chapter
and Section where more information on this method can be found. Empty
fields indicate that we did not do respective measurements and also are not
aware of any institution where such measurements might have been realized.

In practice combined volumetric-gravimetric measurements have been
fairly successful [0.31]. Also densimetric-volumetric and densimetric
gravimetric measurements using magnetic suspension balances (2 positions
and 3 positions types respectively) can be recommended. If swelling sorbent
materials are considered (slow) oscillometric measurements are
recommended, Chap. 5. In case of multicomponent sorption systems (N > 2) a
gas analyzing system has to be used in any case.