For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the____________________?
Correct answer: A. Catalyst size is reduced or the catalyst diffusivity is increased
- A. Catalyst size is reduced or the catalyst diffusivity is increased
- B. Catalyst size is reduced or the catalyst diffusivity is reduced
- C. Catalyst size is increased or the catalyst diffusivity is reduced
- D. Catalyst size is increased or the catalyst diffusivity is increased
Explanation
Effectiveness improves when internal diffusion resistance decreases. Reducing catalyst size shortens the diffusion path, while increasing diffusivity makes transport through the pores easier.
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