Abstract
Isothermal adsorption of p-xylene and m-xylene on NaY, KY and BaY zeolites was studied by thermogravimetry at 25°C. Adsorption isotherms showed type H 4 hysteresis associated with a xylenes adsorption process activated by the pressure. Experimental data were analysed with the t-method to distinguish the amounts of xylene adsorbed in the α-cages and on the external surface of crystallites. Results were compared with those previously achieved by calorimetry. Whatever may be the isomer and the Y zeolite, the adsorption capacity of α-cages at 25 °C is equal to 3.5 molecule α −1. At saturation, the amount of xylenes adsorbed on the external surface represents 13% of the total amount adsorbed on the zeolites and is twice as great for m-xylene than for p-xylene. The adsorption process on the external surface differs from that in α-cages by a low adsorption energy and a high adsorption rate.
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