By 鈴木, 基之, 1941- 鈴木, 基之, ; Motoyuki Suzuki
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A typical result is shown in Fig. 13. 5 nm. One obvious deficiency of the D-A equation is that it does not approach the Henry type equation at lower concentrations. According to chromatographic measurement using helium gas as a carrier (Chihara, Suzuki and Kawazoe, 1978), the adsorption equilibrium coefficient of the Henry type equation, which was assumed to hold at an extreme of C=O, could be determined for MSC 5A. The results are shown in Fig. 14. In this experiment, since helium gas exists in large excess compared with adsorbable tracer gas, the coadsorption effect of helium may not have been negligible, making it possible to assume the Henry type isotherm for the tracer gases.
2. of the adsorption of various gases on MSC-5A are shown in TABLE Characteristic energy of adsorption was correlated by parachor as shown in Fig. 11 (Kawai and Kawazoe, 1975). 2 one can see that a parameter, n, is not necessarily an Also from TABLE integer. n may be a function of relative magnitude of adsorbate molecular size and micropore size. From this point of view, and Suzuki and Sakoda (1982) tried to extend the D-A equation to include adsorbent which has apparent micropore size TABLE 3 2 Characteristic Values of Adsorption on MSC SA Adsorbate Wo [CC /gl n [-I E [call moll I nitrogen 2 carbon d ~ o x ~ d e 3 oxygen 4 hydrogen 5 neon 6 argon 7 krypton 8 xenon 9 methane 10 ethylene I I ethane I2 propylenc 13 n-butane 14 n-hcxanc I5 benzene 16 ethyl acetate 17 p-xylcne 18 trichlorocthylene 19 tetrahydrofuran 20 methykne chloride 2 1 cyclohexane 22 aatone 23 carbon disulfidc 24 methanol 25 ethanol 26 n-butanol 27 acctlc acid 28 ..
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.