Abstract
Zeolite NaY was decationated step-wise until the H-form was obtained (HY), and zeolite HY was dealuminated step-wise to increase its SiO 2/Al 2o 3 ratio from 4.8 to 8.5. Ammonia was adsorbed on all the zeolite forms and was then desorbed thermally in a DSC cell, making use of the programmed temperature-increasing facility available in the DSC system. The total acidity of the zeolite was found to increase with decationation and decrease with dealumination. Strong acidity was found to increase with both decationation and dealumination, whereas weaker acidity decreased. The strength of strong acid sites increased further, whereas that of weaker acid sites decreased in both treatments.
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