| Issue |
Korean Journal of Chemical Engineering,
Vol.17, No.5, 600-612, 2000
Vol.17, No.5, 600-612, 2000
Statistical Condensation Adsorption Isotherms of Gas Molecules Adsorbed on Porous Adsorbents, Surface Monolayer Adsorption Isotherms and Hysteresis Phenomena
Condensation adsorption isotherms of type IV (or V) according to BDDT classification on porous adsorbents composed of one or two groups of adsorption sites are derived statistically. When beta(c1) (or beta(c2)) is less than unity, the isotherm becomes type IV, and when it is greater than unity, the isotherm becomes type V. it is understood that the negative sign(-) of the additional adsorption energy, q, in the nth layer in deriving those theoretical isotherms plays a decisive role on the horizontally flat approach to the axis of the isotherm near the saturation vapor pressure. The values of the surface area can be calculated easily. The pore radii of all the adsorbents which we have obtained by using the derived isotherms with respect to the appropriately selected experimental data agree with those obtained by using the Kelvin equation. Many surface mono-layer adsorption isotherms are obtained in the process of deriving the various adsorption isotherms. From them we can learn that the surface sites are not adsorbed completely even near the saturated vapor pressure, and we can find the range of error by comparing them with v(m)s of the BET equation. We could mention through judging the results of a great deal of the experimental isotherm data of types IV and V that "the cause of hysteresis phenomena of the condensation adsorption-desorption of gases is originated from the deviation from the thermodynamically reversible adsorption-desorption process in the condensation adsorption-desorption of gases".
Keywords:
Pore Condensation Adsorption Isotherms; Surface Mono-layer Adsorption Isotherms; Hysteresis Phenomena
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