Effect of intrapellet mass transfer on activation energy

Neglecting intrapellet mass transfer can lead to misleading conclusions about reaction activation energies.

At ,

For 1^st order reaction, ,

Or

Then the rate of the whole pellet can be written as

Substituting , where E₁ is the true activation energy.

(1)

Now if intrapellet resistance is neglected then the rate of first order reaction is given as

(2)