Discussion
Assertion (A): Regeneration of a coked catalyst uses dilute rather than pure oxygen.
Reason (R): Burning the coke releases enough heat to sinter the catalyst if it is not controlled.
Answer: D
Both are true and the reason gives the hazard: the operation trades one deactivation mechanism for a worse and irreversible one if the temperature is allowed to run. Control of the burn is essential. Dilution keeps the peak temperature down.
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