Abstract
DSC measurements were carried out for zeolite-Y before and after long treatment with ammonium nitrate solution. Not only was the sodium ion in the zeolite exchanged with ammonium ion in this treatment, but changes in the acidity distribution of the zeolite were also detected; the quantity of acid sites increased, whereas their strength decreased. Triethylamine (TEA) was used as a probe base. The extent of Na + exchange with NH + 4 in NH 4NO 3-treated NaY can be traced by at least one DSC effect in the thermograms of exchanged samples.
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