The Knudsen diffusivity is dependent on the ______________________?
Correct answer: D. Molecular velocity and pore radius of the catalyst
- A. Molecular velocity only
- B. Pore radius of the catalyst only
- C. Molecular mean free path only
- D. Molecular velocity and pore radius of the catalyst
Explanation
Knudsen diffusivity is controlled by molecule-wall collisions and is proportional to the pore radius multiplied by the molecular thermal velocity. It therefore depends on both molecular velocity and catalyst pore radius.
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