METHOD FOR SYNTHESIZING AN AFX-STRUCTURE ZEOLITE FROM A MIXTURE OF FAU ZEOLITES IN THE PRESENCE OF AN ORGANIC NITROGEN-CONTAINING STRUCTURING AGENT

摘要

The invention relates to a method for preparing an AFX-structure zeolite, said method comprising at least the following steps: i) in an aqueous medium, mixing at least two FAU-structure zeolites, each of said FAU-structure zeolites having a molar ratio SiO₂/Al₂O₃ of between 2 and 200 inclusive, and a parameter P_ze less than 3250, an organic nitrogen-containing compound R, at least one source of at least one alkali and/or alkaline-earth metal M, the reaction mixture having the following molar composition: (SiO_2(FAU))/(Al₂O_3(FAU)) of between 2 and 32, H₂O/(SiO_2(FAU)) of between 1 and 100, R/(SiO_2(FAU)) of between 0.01 and 0.6, M_2/nO/(SiO_2(FAU)) of between 0.005 and 0.45, limits included, in order to obtain a homogeneous precursor gel; and ii) subjecting the precursor gel resulting from step (i) to hydrothermal treatment.