Discussion
Arrange the steps of a heterogeneous catalytic reaction in order.
1. adsorption, surface reaction and desorption
2. diffusion of reactant from the bulk to the outer surface
3. diffusion of product back out to the bulk
4. diffusion into the pores of the particle
Answer: C
The sequence is a series of resistances, and the slowest step controls the observed rate. Which one that is decides how the reactor should be designed and what will improve it. The slowest step controls the observed rate.
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