Chemical Reaction Engineering
Space time in flow reactor is

Both A and B
A measure of its capacity
Usually equal to the residence time
The reciprocal of the space velocity

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Chemical Reaction Engineering
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?

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
There is no dynamic equilibrium between successive layer
Langmuir
None of these

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