Hydrothermal transformation of magadiite into ferrierite in Al2O3–Na2O–ethylenediamine–H2O system

This study investigated the transformation of magadiite into ferrierite in Al2O3–Na2O–ethylenediamine (EDA)–H2O system. The influence of various parameters such as reaction temperature, time, alkalinity, the reactant Na2O/SiO2 ratio and EDA/SiO2 ratio were examined. Thermal and acid stability of the synthetic ferrierite are presented. Highly crystallized and pure ferrierite could be obtained from dispersion with the molar composition: 0.01 Na2O: 0.005 Al2O3: SiO2: 30 H2O: 20 EDA by heating at 433 K for 48 h. The structure of ferrierite was destroyed when the temperature rose above 873 K and the framework of the sample, stirred in 5 mol/L HCl for 3 h, is consistent with the untreated ferrierite.

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► Various reactant parameters play an important role in ferrierite synthesis.
► Ferrierite can be obtained through transformation of magadiite.
►  The as-synthesized ferrierite exhibits well acid stability.