Surface acidity of cerium exchanged Y-zeolite

Surface acidities of Ce^III, Ce^IV and Ce^III, Ce^IV] containing Na-Y zeolites were determined by means of n-butylamine titration in benzene using Hammett indicators in the range H_o: +6.8 to H_o: –8.2. Total acidites of Ce^IVNaY zeolites until 51% Ce^IV exchange were found to be small (0.80 mequ/g at H_o: +6.8) but formed preferably strong acidic centers (H_o: –5.6) even at low degrees of exchange. Ce^IIINaY displayed an acidity pattern similar to that which is known from lanthanum exchanged NaY faujasites under the same pretreatment conditions.

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NaY, Ce^III, Ce^IV Ce^III, Ce^IV], -, H_o: +6,8 H_o:–8,2. Ce^IVNaY 51%- Ce^IV (=0,80 / H_o: +6,8), (H_o: –5,6) . Ce^IIINaY NaY .