02-P-34 - Static synthesis of zeolite MCM-22

Abstract

This chapter describes the static synthesis of zeolite MCM-22. Zeolite MCM-22 is synthesized as a pure phase and with good crystallinity under static conditions by using either two-step method or a seeding method. In the two-step method, an initial crystallization step at a much higher temperature makes it possible to statically synthesize a high-quality MCM-22, which considerably reduces the time for the crystallization and the consumption of the organic template. In this method, the silica sources with lower surface areas can yield zeolite MCM-22. The directing-gel prepared at a higher temperature similarly has the desired effect on the static synthesis of MCM-22, and the aging step can be left out in this method.