Discussion
Match each deactivation mechanism with its usual remedy.
List I
A. Coking
B. Poisoning by sulphur
C. Sintering
D. Fouling by dust
List II
1. no remedy, so avoid excessive temperature
2. burn off the deposit in a controlled regeneration
3. filter the feed and screen the bed
4. remove the sulphur from the feed upstream
Answer: A
Only some kinds of deactivation are reversible, and sintering in particular is not. Knowing which is which decides whether a catalyst charge can be recovered or must be replaced. Sintering is the one that cannot be undone.
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