Chemical Reaction Engineering
Semibatch reactor is preferred, when a/an

A highly exothermic reaction is to be controlled
Undersirable side reaction (at high concentration of one of the reactants) is to be avoided
A gas is to be reacted with liquid (e.g. hydrogenation of fat)
All of these

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Chemical Reaction Engineering
Promoter.

All of these
Atlers the position of equilibrium in a reversible reaction
Initiates a chemical reaction and is a catalyst by itself
Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

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