Chemical Reaction Engineering
Promoter.

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
All of these
Atlers the position of equilibrium in a reversible reaction

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Chemical Reaction Engineering
Batch process is preferred over continuous process, when the

Same equipment can not be used for several processes of the same nature
Sales demand of product is not steady
Product yields and quality can not be achieved in continuous process, because of long residence time
All of these

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

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

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