Cooperative Structure-Directing Effects in the Synthesis of a High-Silica Zeolite Mazzite Analogue

Abstract

A zeolite Mazzite (MAZ) analog with high silica content has been synthesized from a Na2O-Al2O3-SiO2-morpholine-H2O system. The crystal morphol. of this MAZ analog was found to consist of spherical agglomerates of diam. up to 17 μm. It has been unequivocally demonstrated that zeolite Mordenite (MOR) or amorphous material was produced instead in the absence of either morpholine or Na+. Assocd. phases indicate that the MAZ may be a "intermediate phase" between the crystn. fields of zeolites Analcime (ANA) and MOR. Thus, the zeolite MAZ analog is seemingly derived from the cooperative structure-directing effect of the org. mol. morpholine and the inorg. cation Na+. The results of CHN elemental analyses as well as of thermogravimetric (TG) analyses confirmed that morpholine had been incorporated into the zeolitic structure. [on SciFinder(R)]