Chemical Reaction Engineering
Promoter.

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

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Chemical Reaction Engineering
A batch reactor is

Suitable for liquid phase reactions involving small production rate
Suitable for gas-phase reactions on commercial scale
Most suitable for very large production rate
Least expensive to operate for a given rate

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