Mechanism of catalyst on morphological evolution of Al(OH)3 during Al–H2O reaction

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(24)66476-9

Wen-qi TANG , Ji-yi ZHU , Hui SUN , Yong-fei JUAN , Chao-peng FU , Jian YANG , Jiao ZHANG

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Abstract

The morphologies of Al(OH)₃ crystals prepared via the Al–H₂O reactions with various catalysts and the growth mechanisms of these crystals were investigated. The reaction was carried out with NaOH, KOH, tetramethylguanidine (TMG), and tetramethylammonium hydroxide (TMAH) as catalysts. The evolution of the obtained product was observed in situ, and the products obtained after 120 min of reaction have the shapes of the hexagonal prism, long-hexagonal prism, long rod, and irregular rod, respectively. In the NaOH and KOH systems, the products are gibbsite, and the gibbsite crystals grow along the (110), (001), and (100) faces in the NaOH system, and the (100), (102), and (110) faces in the KOH system. However, in the TMG and TMAH systems, the products are bayerite, and the bayerite crystals grow along the (110), (111), and (001) faces. It is worth mentioning that gibbsite has more Al—O bonds than bayerite, giving rise to the formation of columnar crystals.

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Al-H2O 反应过程中催化剂对 Al(OH)3 形貌演变的影响机理

研究了在不同催化剂作用下通过 Al-H2O 反应制备的 Al(OH)3 晶体的形态及其生长机理。反应以 NaOH、KOH、四甲基胍（TMG）和四甲基氢氧化铵（TMAH）为催化剂。原位观察了所得产物的演变过程，反应 120 分钟后得到的产物形状分别为六方棱柱、长六方棱柱、长棒状和不规则棒状。在 NaOH 和 KOH 体系中，产物为吉布斯特，在 NaOH 体系中，吉布斯特晶体沿（110）、（001）和（100）面生长，在 KOH 体系中，吉布斯特晶体沿（100）、（102）和（110）面生长。然而，在 TMG 和 TMAH 体系中，产物是贝叶石，贝叶石晶体沿着 (110)、(111) 和 (001) 面生长。值得一提的是，辉绿岩的 Al-O 键比贝叶石多，从而形成了柱状晶体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.