Abstract
Acidity distributions of REX and REY zeolites have been determined after pretreatment under various conditions. These acidities are correlated with the catalytic performance of the zeolites in gas oil cracking. It was found that hydrothermal treatment of the zeolites leads to a decreased number of strong acid sites, while the number of sites with intermediate and weak acid strength remain unchanged. The disappearance of the strong acid sites results in an increased cracking selectivity, especially for the REY type zeolites. This study shows that the selectivity in catalytic cracking for gasoline, gas and coke production is very much dependent on the total number of acid sites as also on the acidity distribution in the catalyst.
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