CHARACTERIZATION OF THE DEALUMINATION EFFECT INTO H-FAUJASITES BY ADSORPTION .2. THE HEXANE MOLECULE AS A PORE VOLUME PROBE

Thermogravimetric studies under controlled vapor pressure are made at 25-degrees-C to measure adsorption and desorption isotherms of n-hexan e on a series of dealuminated HY zeolites. These had been characterize d by water vapor adsorption in Part 1 of this paper. Contrary to what was observed for water adsorption, isotherms always show a very high a dsorption capacity in the very low pressures and a H4 hysteresis loop. The micropore maximal volume accessible to the adsorbate, the mesopor e volume, and the adsorption energy are discussed with regard to the d ealumination degree of the HY zeolites.