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Which of the following represents series type deactivation model? (Where R is the product and P is the poison)

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Which of the following represents series type deactivation model? (Where R is the product and P is the poison)

(a) A → R → P↓

(b) A → P↓

(c) A  →  R + P↓

(d) A → R, A → P

I had been asked this question during an interview.

My question is from Mechanisms of Catalyst Deactivation topic in chapter Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

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Correct answer is (a) A → R → P↓

Explanation: The series deactivation is the mechanism in which the product may decompose to produce the poison or further react to produce the poison. The poison deposits on the catalyst and causes deactivation.

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