Chemical Engineering

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8041. Brunaur, 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?

Langmuir
There is no dynamic equilibrium between successive layer
The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process
None of these
✅ The correct answer is option B.

8043. In Langmuir treatment of adsorption,

Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
All the adsorption does not take place by the same mechanism
Extent of adsorption is more than one complete monomolecular layer on the surface
✅ The correct answer is option B.
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