Thermal decomposition, gas phase hydration and liquid phase reconstruction in the system Mg/Al hydrotalcite/mixed oxide: A comparative study
Mokhtar M, Inayat A, Ofili IJ, Schwieger W (2010)
Publication Status: Published
Publication Type: Journal article
Publication year: 2010
Journal
Publisher: Elsevier
Book Volume: 50
Pages Range: 176-181
DOI: 10.1016/j.clay.2010.07.019
Abstract
The thermal decomposition of a synthetic Mg/Al hydrotalcite and the subsequent hydration of the calcined products in the presence of water vapor at 30 degrees C were studied by in situ XRD. A comparative study between the gas phase hydration and reconstruction of calcined hydrotalcite in Na(2)CO(3) solution at 25 and 70 degrees C was investigated. TG coupled to a mass spectrometer was used to study the thermal behaviour of synthetic hydrotalcite. SEM images were taken to show the layering and size of crystals. Thermal decomposition of hydrotalcite led to the formation of a dehydrated intermediate phase at 200 degrees C. followed by crystalline MgO formation at 450 degrees C. Hydration of calcined hydrotalcite in H(2)O/N(2) resulted in the formation of broad pattems of the meixnerite phase after 2 h. This phase retained its structure even after 52 h exposure to water vapor. Reconstruction of the calcined products in carbonated water at 25 and 70 degrees C resulted in intensified patterns of the hydrotalcite phase. Due to the different structural and compositional properties of the layered products obtained by different chemical reactions of the mixed oxide phase a clarification of nomenclature for all phase transforming steps is proposed. (c) 2010 Elsevier B.V. All rights reserved.
Authors with CRIS profile
Alexandra Inayat
Lehrstuhl für Chemische Reaktionstechnik (CRT)
Ifeanyi Jimmy Ofili
Professur für Technische Chemie (Reaktionstechnik)
Wilhelm Schwieger
Professur für Technische Chemie (Reaktionstechnik)
Additional Organisation(s)
Involved external institutions
Saudi Arabia (SA)How to cite
APA:
Mokhtar, M., Inayat, A., Ofili, I.J., & Schwieger, W. (2010). Thermal decomposition, gas phase hydration and liquid phase reconstruction in the system Mg/Al hydrotalcite/mixed oxide: A comparative study. Applied Clay Science, 50, 176-181. https://doi.org/10.1016/j.clay.2010.07.019
MLA:
Mokhtar, M., et al. "Thermal decomposition, gas phase hydration and liquid phase reconstruction in the system Mg/Al hydrotalcite/mixed oxide: A comparative study." Applied Clay Science 50 (2010): 176-181.
BibTeX: Download