Abstract
Acid-leached and unleached Y zeolites dealuminated by steam calcination have been characterized by spectroscopic techniques and chemical analysis. Measurement of the free volumes of the supercages has been carried out by benzene adsorption. The experimental results are mathematically conclusive, and it appears that the amorphous phase obtained after dealumination is quasi-aluminous (SiO 2 < 5%) of which 65% is localized in the supercages. The zeolitic framework is conserved during partial dissolution of the extralattice aluminous fraction, but 10% of it is destroyed during strong acid leaching and the silica is then exposed. The same technique can be used to localize a solid additive obtained after impregnation of the Y zeolites.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
