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Typical Hysteresis of Adsorption-Desorption Cycle

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–Starting from the second layer E1»EL energy of molecules in liquid state

E1 = Energy of adsorption for the first layer

El  = Energy of liquid state

surface so covered with 0 adsorbed layers

…     s1          …           1

…                  …           …

…     si           …            i

Accessible surface A = so + s1 + … + si + …

– N= number of layers

x = p/p0 = relative equilibrium

pressure

––if N ® ¥
–Transformed  equation BET

CO & CH4

Typical for heterogeneous surface

Dadsh (»2 kJ.mol-1) during the capillary condensation

Kr

Dadsh (»5 kJ.mol-1) during the capillary condensationÜ solidification ?

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