GENERAL AND INORGANIC-CHEMISTRY - STUDY OF THE STABILITY OF ZEOLITES NA-A AND NA-X IN MOTHER LIQUORS

It was shown that Na zeolites of A and X types are unstable under the conditions of hydrothermal synthesis and are easily recrystallized to form other zeolites with more compact crystal structures and higher Si /Al ratios. Zeolite X is recrystallized to phillipsite (zeolite P), an d zeolite A is recrystallized to phillipsite from gels with the SiO2/A l2O3 ratio equal to 2 and to sodalite from gels with SiO2/Al2O3 < 2 (z eolite J). The nucleation of secondary zeolite phases occurs as the re sult of rearrangement and decomposition of the lattice of primary crys tals.