Chemical Reaction Engineering
If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to

The intrinsic activation energy E
(E + ED) where ED is activation due to diffusion
(E + ED)/2
ED/2

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

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

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