'If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the_____________________?
Correct answer: B. Temperature
- A. Pressure
- B. Temperature
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
Knudsen diffusivity varies approximately with the square root of absolute temperature because molecular velocities increase with temperature. It is essentially independent of pressure, since wall collisions dominate over molecule-to-molecule collisions in very small pores.
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