Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation ?
Correct answer: D. There is no dynamic equilibrium between successive layer
- A. Langmuir's assumption applies to every adsorbed layer
- B. (except the first one) is involved in each of the evaporation process
- C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer
- D. There is no dynamic equilibrium between successive layer
- E. None of these
Explanation
BET theory assumes dynamic equilibrium between successive adsorbed layers, so the statement that no such equilibrium exists is not a BET postulate. It also allows multilayer adsorption, with the first-layer heat differing from the condensation-like heat of later layers.
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