Hydrothermal preparation and crystal habit of X-zeolite powder

来源期刊：中南大学学报(英文版)2005年第3期

论文作者：申少华 张术根 王大伟 方克明

文章页码：315 - 319

Key words：X-zeolite powder; acid-treated stellerite; hydrothermal preparation; crystal habit

Abstract: The preparation of X-zeolite powder was investigated in hydrothermal system, the crystal growth process of X-zeolite in hydrothermal condition was characterized by means of X-ray diffraction, scanning electron microscope and infrared ray. The results show that X-zeolite powder with uniform granularity and intact crystal shape can be obtained in hydrothermal system of acid-treated stellerite NaOH NaAl(OH)₄H₂O; the crystallite size is in the range of 2 3μm. The best reaction time of hydrothermal preparation is 6 h. The formation phases of X-zeolite crystal are as follows: dissolution of feedstocks→formation of [SiO₄]^4-and [AlO₄]^5-tetrahedron, many-mem-bered ring,βcage→formation of crystal nucleus and nano-particle→aggregation growth of nano-particle→coales-cence growth of crystallite. The crystal habits of X-zeolite are intimately related with crystallization orientation of β cage in crystal and with its coupling stability on every crystal face family.