Transactions of the INDIAN CERAMIC SOCIETY Vol. 34 1975
The Faujasite Family of Molecular Sieve Zeolites ·
Part !-Synthesis and Characterization
(MISS) MINATI CHATTERJEE, DIBYENDU GANGULI AND PRASENJIT SAHA,
Pages : 87-93
DOI : 10.1080/0371750X.1975.10840616
Abstract
Sodium zeolites X and Y (Si02/Al20 3 ratio varying between 2.15 and 4.40), belonging
to the faujasite family of molecular sieve zeolites. were synthesized at 80°-150oC from gels of
different alkali and silica concentrations. Free gel, zeolite A and zeolite NaP* were found
to be the most common impurities likely to be obtained while crystallizing zeolites X and Y
from sodium aluminosilicate gels. Formation andjor persistence of these impurities were found
to be dependent on the water content of the starting gel, or the time of crystallization.
Synthesis of ultrastable Y zeolite was achieved by stepwise (though incomplete) removal
of Nat ions from a NaY sample. The compositional breaks and the associated problems of
an uniform nomenclature for the entire range of the faujasite family of zeolites are
discussed.
