Mechanistic Study of the Influence of Reactant Type and Addition Sequence on the Microscopic Morphology of α-Al[sub.2]O[sub.3]

To perform an in-depth study of the crystal growth habits and phase changes of alumina and its precursors in reaction systems, this paper studied the effects of reactant type and addition order on the morphology of alumina using hydrothermal methods with different precipitants and aluminum sources a...

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Published in:Applied sciences 2024-03, Vol.14 (6)
Main Authors: Wen, Weixiang, Bai, Yang, Xu, Mengxu, Gao, Yujuan, Yan, Pingke, Xu, Huabing
Format: Article
Language:English
Subjects:
Aluminum oxide
Aluminum sulfate
Carbonates
Chemical tests and reagents
Sodium bicarbonate
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creator Wen, Weixiang
Bai, Yang
Xu, Mengxu
Gao, Yujuan
Yan, Pingke
Xu, Huabing
description To perform an in-depth study of the crystal growth habits and phase changes of alumina and its precursors in reaction systems, this paper studied the effects of reactant type and addition order on the morphology of alumina using hydrothermal methods with different precipitants and aluminum sources as reactants. Research has shown that sodium bicarbonate and ammonium bicarbonate can be used as precipitants to prepare adhered spherical alumina and irregular short rod alumina, while potassium bicarbonate can be used as a precipitant to prepare hexagonal flake alumina. Using aluminum sulfate octahydrate, aluminum chloride hexahydrate, and aluminum nitrate, nine hydrates were prepared as aluminum sources, and agglomerated alumina, irregular short rod-shaped alumina, and fused alumina were obtained. The order of reactant addition affects the precursor phase of alumina, thereby affecting the microstructure of alumina after calcination, resulting in flake alumina with pores and short rod alumina. The results of this paper will provide theoretical guidance for the preparation of alumina with different micromorphologies.
doi_str_mv 10.3390/app14062438
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subjects Aluminum oxide
Aluminum sulfate
Carbonates
Chemical tests and reagents
Sodium bicarbonate
title Mechanistic Study of the Influence of Reactant Type and Addition Sequence on the Microscopic Morphology of α-Al[sub.2]O[sub.3]
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