Syntheses of Pentasil Silica-Zeolites From Nonaqueous Systems

Three types of pentasil silica-zeolites, silicalite-1, ZSM-39 and ZSM-48, have been synthesized from organic solvents in the presence of specific templating agents or crystal seeds. The crystalline products were characterized by means of X-ray diffraction(XPD), infrared(IR), thermoanalysis and composition analysis. The kind of product was remarkably dependent on the contents of alkali and templating agents used in the reaction mixtures. The present results showed that not only the zeolites with 4- and 6-membered rings but also the zeolites with 5-membered ring can be synthesized in nonaqueous media.