Splicing growth of zeolite 4A in hydrothermal system
(1.Material Chemistry Laboratory,Nanjing University of Science and
Technology, Nanjing 210094, China;
2.Institute of Geology, Central South University, Changsha 410083, China)
Technology, Nanjing 210094, China;
2.Institute of Geology, Central South University, Changsha 410083, China)
Abstract: The morphology evolution of zeolite 4A in hydrothermal system was studied via XRD, TEM and electron diffractometry. A phenomenon of aggregation of nano-crystals of zeolite 4A exists in the crystallization process, and microcrystals are derived from nano-crystal aggregating directly. The splicing growth model of zeolite 4A is described as: 1)an 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.
Key words: splicing growth, zeolite, aggregating growth, crystal growth, nanocrystal, hydrothermal synthesis