Abstract:

A serious of zeolites Y of high Si/Al and high crystalline have been prepared by treatment with silicon tetrachloride vapour. Adsorption isotherms for n-Hexane have been measured by vacume gravimetric on a series of samples at various temperatures. The relationship between uptake of sorbate on a series of samples and dealumination extent and temperature have been obtained. Differential heats of adsorption, differential entropies and heat capacities of adsorbed substance have been calculated from the isotherms. The nature of surface and intracrystalline porosity of dealuminated zeolite Y have been further considered from the results of our experiments.

Key words: Dealumination, Y zeolite, Adsorption, Thermodynamic