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Effects of Different Raw Materials in the Synthesis of Boehmite and γ- and α-Alumina
Joint Authors
Padilla, Isabel
López-Delgado, Aurora
López-Andrés, Sol
Source
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-11-10
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
Two alumina polymorphs, the metaestable γ-Al2O3 and the stable α-Al2O3, were obtained from thermal treatment of the precursor γ-AlOOH (boehmite).
This precursor was prepared by a precipitation method employing different raw materials in order to study their effect on the synthesis process and several characteristics of the materials, such as the crystallite size, the thermal behavior, and the surface area.
Aluminum chloride (AlCl3·6H2O) and an aluminum waste were used as the source of aluminum.
A 1 M NaOH solution and a 1 M n-butylamine solution were used as alkalizing agents, due to their strong and weak alkaline characteristics, respectively.
The XRD profiles of the boehmites obtained from waste show lower crystallinity than samples obtained from aluminum chloride.
The content of water, from TG studies, was higher in the samples obtained from waste, which fit well with the smaller crystallite size.
The use of n-butylamine as alkalizing agent favors the formation of γ-alumina with higher surface area (177.2 cm2 g−1, for aluminum waste, and 159.4 cm2 g−1, for aluminum pure reagent).
The temperature of transformation from gamma to alpha, from DTA results, is higher for samples obtained from the waste, and accordingly the presence of impurities in the waste stabilizes the metastable alumina phase.
American Psychological Association (APA)
Padilla, Isabel& López-Andrés, Sol& López-Delgado, Aurora. 2016. Effects of Different Raw Materials in the Synthesis of Boehmite and γ- and α-Alumina. Journal of Chemistry،Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1107700
Modern Language Association (MLA)
Padilla, Isabel…[et al.]. Effects of Different Raw Materials in the Synthesis of Boehmite and γ- and α-Alumina. Journal of Chemistry No. 2016 (2016), pp.1-6.
https://search.emarefa.net/detail/BIM-1107700
American Medical Association (AMA)
Padilla, Isabel& López-Andrés, Sol& López-Delgado, Aurora. Effects of Different Raw Materials in the Synthesis of Boehmite and γ- and α-Alumina. Journal of Chemistry. 2016. Vol. 2016, no. 2016, pp.1-6.
https://search.emarefa.net/detail/BIM-1107700
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1107700