Discussion
Consider the following statements about the effectiveness factor.
1. A value near one indicates no significant diffusion limitation.
2. It falls as the particle size increases.
3. It rises as the intrinsic reaction rate increases.
Answer: C
The first two are correct. The third is inverted, since a faster intrinsic reaction consumes the reactant nearer the surface and leaves the interior starved. Particle size is the main design lever. Intrinsic activity is not always the answer.
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