Splicing growth of zeolite 4A in hydrothermal system

摘要

The morphology evolution of zeolite 4A in hydrothermal system was studied via XRD, TEM and electron dif-fractometry. A phenomenon of aggregation of nano-crystals of zeolite 4A exists in the crystallization process, and micro-crystals are derived from nano-crystal aggregating directly. The splicing growth model of zeolite 4A is described as: Dan induction period which exists at the beginning of crystallization, 2)followed by many nano-meter crystals initiating immediately, and 3) the nanocrystals congregated as slices and spliced with each other to form a larger crystal.