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

Abstract This study investigated the transformation of magadiite into ferrierite in Al 2 O 3 –Na 2 O–ethylenediamine (EDA)–H 2 O system. The influence of various parameters such as reaction temperature, time, alkalinity, the reactant Na 2 O/SiO 2 ratio and EDA/SiO 2 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 Na 2 O: 0.005 Al 2 O 3 : SiO 2 : 30 H 2 O: 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.