Download PDF by Do D.D.: Adsorption analysis: Equilibria and kinetics

By Do D.D.

ISBN-10: 1860941303

ISBN-13: 9781860941306

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Example text

Fig 3 7 BET plot of gas phase adsorpt~on~sotherm. and approaches saturation limit at high pressures. When the parameter, t, is unity, the above equation is identical to the Langmuir equation. Fig. 6 shows the effect of parameter, I , on the shape of the isotherm. When adsorption takes place in multilayers, adsorption on the adsorbent surface and above the adsorbed molecules is considered to be based on different attractive forces. Monolayer adsorption is formed by the same concept as the Langmuir type adsorption while adsorption above monolayers is equivalent to condensation of the adsorbate molecules, giving rise to the BET (Brunauer, Emmett and Teller, 1938) equation where p, is the relative pressure (=p fp,) and q, represents the amount adsorbed by monomolecular coverage on the surface.

18 by the arrow. 18, transition from Henry type isotherm and Freundlich type isotherm can be said to occur at around 4X 10-lmol/kg. Amount adsorbed. q (mole/kg) Ftg 3 18 lsoster~cheat of adsorption Qstr plotted against amount adsorbed q (Reproduced w ~ t hpermlsston by Suzukl, M and FUJII,T , AIChE Journal 28, 384 (1982)) TABLE 3 3 Constants of Freundl~chType Equatlon q=kcllm Apphcd to the isotherm results for q> lW1 rnol/kg Temperature (K) 283 293 303 313 (Reproduced wrth ( 1982)) permission k n QoIRT 0 55 0 49 0 43 0 32 2 74 2 64 2 52 2 45 300 by Suzukl, 2 71 M and FUJII,T .

Where q0 I and q02 are the amounts of pure components adsorbed a t pressure pa I = P a n d p02 = P. The above relation is derived from Eq. (342). For adsorption of mixtures of hydrocarbons, Eq. (345) is valid since a,) becomes relatively constant independent of concentration. The examples of measurement by Lewis et al. (1950) are shown in Fig. 19. The extended Langmuir (Markham-Benton) isotherm has limited applicability especially for liquid phase adsorption, since even singlecomponent isotherms in liquid phase are rarely explained by the Langmuir equation.

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Adsorption analysis: Equilibria and kinetics by Do D.D.


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