Thermal decomposition, gas phase hydration and liquid phase reconstruction in the system Mg/Al hydrotalcite/mixed oxide: A comparative study

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Details zur Publikation

Autor(en): Mokhtar M, Inayat A, Ofili IJ, Schwieger W
Zeitschrift: Applied Clay Science
Verlag: Elsevier
Jahr der Veröffentlichung: 2010
Band: 50
Seitenbereich: 176-181
ISSN: 0169-1317


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.



FAU-Autoren / FAU-Herausgeber

Inayat, Alexandra Dr.-Ing.
Lehrstuhl für Chemische Reaktionstechnik
Ofili, Ifeanyi Jimmy
Professur für Technische Chemie (Reaktionstechnik)
Schwieger, Wilhelm Prof. Dr.
Professur für Technische Chemie (Reaktionstechnik)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Autor(en) der externen Einrichtung(en)
King Abdulaziz University (KAU) / جامعة الملك عبد العزيز


Zitierweisen

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://dx.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.

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