Crystallization of Zeolity Y from Aqueous Solution

Abstract

ZeoliteY was s ynthesizedfr om homogeneouasq ueouss olutionsa t 100°Cu nder atmospheric pressure, and was grown as a single phase from a clear solution with the iutia1 composition of 10 Na₂O.0.45 Al₂O₃⋅26 SiO₂⋅270H₂O. As a reaction time was prolonged, zeolites S and Pc appeared in the solution, and in final, zeolite Y formed previously decomposed to zeolite Pc. The effect of the discontinuous change of soda, alumina at41 silica concentrations in mother liquors in the course of the reaction was examined on the tability of crystallizingz eoliteiY. The results, show that the reduction of their concentrations due to the formation of zeolites causes the conversiono f zeolite Y to Pc. The chemicala nalysis data of synthetic zeolite Y lead a conclusionth at polymer speciesh aving the compositiona nd structure a nalogoust o those of crystallized zeolite Y exist in the mother liquor.