The Crystal Size and Morphology of Silicalite as Influenced by Gel Nucleation Temperature, Alkalinity and Sodium-Chloride Concentration

Abstract

The influence of sodium chloride, nucleation temperature and alkalinity on crystal size and product morphology of silicalite is described for crystallizations at temperatures of about 170°C. Addition of sodium chloride and increasing alkalinity produce crystals with less intergrowth. Nucleating the gel at 90°C before crystallization significantly reduces crystal size. The intergrowths on the faces of silicalite can be separated and features of the interlocking of separate crystal entities revealed.