Vieillissement des catalyseurs de craquage sous l'effet des conditions hydrothermiques et du dép t de métaux Aging of Cracking Catalysts under the Effect of Hydrothermal Conditions and Metal Deposits

This article is a bibliographic update on the aging of FCC catalysts under the effect of the severe hydrothermal conditions encountered in regenerators in industrial plants as well as metallic poisons, mainly nickel and vanadium, contained in feedstocks. After examining the changes or degradations undergone by catalysts, particularly by the zeolite Y they contain, and their consequences on catalytic performances, various solutions described in the literature are given, some of which are used industrially.