Discussion
Coke deposited on a catalyst is usually removed by
Answer: C
Correct answer: burning it off in dilute oxygen
Coke is burned off in air heavily diluted with steam or nitrogen, and the dilution is the point: the combustion is strongly exothermic, and undiluted air would produce a temperature excursion that sinters the metal and destroys the support - converting a reversible deactivation into a permanent one. The burn is therefore controlled by limiting the oxygen supplied rather than the rate of reaction.
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