METHOD FOR SYNTHESIZING AN AFX-STRUCTURE ZEOLITE OF VERY HIGH PURITY IN THE PRESENCE OF AN ORGANIC NITROGEN-CONTAINING STRUCTURING AGENT

    公开(公告)号:US20210188651A1

    公开(公告)日:2021-06-24

    申请号:US17057364

    申请日:2019-05-16

    Abstract: The invention relates to a process for preparing an AFX-structure zeolite comprising at least the following steps:
    i) mixing, in an aqueous medium, an FAU-structure zeolite having an SiO2 (FAU)/Al2O3 (FAU) molar ratio of between 6.00 and 200, limits included, an organic nitrogenous 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: (SiO2 (FAU))/(Al2O3 (FAU)) between 6.00 and 200, H2O/(SiO2 (FAU)) between 1.00 and 100, R/(SiO2(FAU)) between 0.01 and 0.60, M2/nO/(SiO2(FAU)) between 0.005 and 0.45, limits included, until a homogeneous precursor gel is obtained;
    ii) hydrothermal treatment of said precursor gel obtained on conclusion of step i) at a temperature of between 120° C. and 220° C., for a time of between 12 hours and 15 days.

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