Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?
Correct answer: A. Ash resistance
- A. Ash resistance
- B. Gas film and pore surface diffusion resistances for reactants
- C. Surface phenomenon resistance
- D. Gas film and pore surface diffusion resistances for products
Explanation
A gas-solid catalytic reaction may involve gas-film transfer, pore diffusion, and surface reaction, but it does not form an ash layer. Ash resistance is characteristic of noncatalytic reactions involving a shrinking or reacting solid particle.
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