The importance of diffusion in catalyst pellets can often be determined by measuring the effect of pellet
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Question:
The importance of diffusion in catalyst pellets can often be determined by measuring the effect of pellet size on the observed reaction rate. In this exercise, consider an irreversible first-order reaction occurring in catalyst pellets where the surface concentration of reactant A is CAS=0.15 M.
Data:
Diameter of sphere cm | 0.2 | 0.06 | 0.02 | 0.01 | 0.008 | 0.006 |
robs (mol/h/cm3) | 0.25 | 0.8 | 1.8 | 2.4 | 2.5 | 2.5 |
a.) Calculate internal effectiveness factor for each particle size
b.) Identify particles that experience no, negligible, intermediate, or strong diffusion limitation.
c.) Estimate the Thiele modulus for a catalyst particle of diameter 0.1 cm.
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