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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Splicing growth of zeolite 4A in hydrothermal system
LI Yan(李 酽)1 , WANG Xin(汪 信)1,
YANG Xu-jie(杨绪杰)1, ZHANG Shu-gen(张术根)2

1.Material Chemistry Laboratory,Nanjing University of Science and
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

ISSN 1672-7029
CN 43-1423/U

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