Chemical Reaction Engineering
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for

Slow reactions in catalyst of large pore diameter
Fast reaction in catalyst of large pore diameter
Fast reactions in catalyst of small pore diameter
Slow reactions in catalyst of small pore diameter

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Chemical Reaction Engineering
Promoter.

Atlers the position of equilibrium in a reversible reaction
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

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