| Hydrothermal preparation and crystal habit of X-zeolite powder |
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| 作者姓名： | 申少华 张术根 王大伟 方克明 |
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| 作者单位： | [1]SchoolofChemistryandChemicalEngineering,HunanUniversityofScienceandTechnology,Xiangtan411201,China／／SchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China [2]SchoolofGeoscienceandEnvironmentalEngineering,CentralSouthUniversity,Changsha410083,China [3]SchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China |
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| 摘 要： | The preparation of X-zeolite powder was investigatedin 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)4-H2O; 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-membered ring,β cage → formation of crystal nucleus and nano-particle → aggregation growth of nano-particle → coalescence growth of crystallite. The crystal habits of X-zeolite are intimately related with crystallization orientation ofβ cage in crystal and with its coupling stability on every crystal face family.
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| 关 键 词： | X沸石 酸化红辉沸石 热液加工 结晶形态 |
| 收稿时间： | 15 April 2004 |
| 修稿时间： | 15 August 2004 |
Hydrothermal preparation and crystal habit of X-zeolite powder |
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| Shen Shao-hua , Zhang Shu-gen , Wang Da-wei and Fang Ke-ming.Hydrothermal preparation and crystal habit of X-zeolite powder[J].Journal of Central South University of Technology,2005,12(3):315-319. |
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| Authors: | Shen Shao-hua Zhang Shu-gen Wang Da-wei and Fang Ke-ming |
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| Affiliation: | (1) School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, 411201 Xiangtan, China;(2) School of Geoscience and Environmental Engineering, Central South University, 410083 Changsha, China;(3) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 100083 Beijing, China |
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| 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)4-H2O; the crystallite size is in the range of 2–3 μm. 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-membered ring, β cage → formation of crystal nucleus and nano-particle → aggregation growth of nano-particle → coalescence 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. |
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| Keywords: | X-zeolite powder acid-treated stellerite hydrothermal preparation crystal habit |
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