Abstract
n-Hexane and o-xylene transformations were studied on protonic offretite and Y zeolite before and after catalyst poisoning by pyridine. Offretite is six times more active than Y in n-hexane cracking and this confirms that it has a stronger acidity. However, offretite is one half as active in o-xylene isomerization, probably because of configurational limitations caused by a few stacking faults in its porous structure. On Y zeolite, pyridine can suppress completely both o-xylene isomerization and n-hexane cracking, however, on offretite, while suppressing completely o-xylene isomerization, it only partly affects n-hexane cracking. Some very strong acid sites of offretite (at least 20%) are, therefore, inside the gmelinite cages and are only accessible to n-hexane. Because of their position, these sites allow neither the secondary transformation of cracking products nor coke formation.
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