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Synthesis and thermal stability of hydrotalcites based upon gallium

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Abstract

Hydrotalcites based upon gallium as a replacement for aluminium in hydrotalcite over a Mg/Al ratio of 2:1 to 4:1 were synthesised. The d(003) spacing varied from 7.83 Å for the 2:1 hydrotalcite to 8.15 Å for the 3:1 gallium containing hydrotalcite. A comparison is made with the Mg/Al hydrotalcite in which the d(003) spacing for the Mg/Al hydrotalcite varied from 7.62 Å for the 2:1 Mg hydrotalcite to 7.98 Å for the 4:1 hydrotalcite. The thermal stability of the gallium containing hydrotalcite was determined using thermogravimetric analysis. Four mass loss steps at 77, 263–280, 485 and 828 °C with mass losses of 10.23, 21.55, 5.20 and 7.58% are attributed to dehydration, dehydroxylation and decarbonation. The thermal stability of the gallium containing hydrotalcite is slightly less than the aluminium hydrotalcite.

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Acknowledgements

The financial and infra-structure support of the Queensland Research and Development Centre (QRDC-RioTintoAlcan) and the Queensland University of Technology Inorganic Materials Research Program of the School of Physical and Chemical Sciences are gratefully acknowledged. One of the authors (LMG) thanks the Queensland University of Technology for a visiting student fellowship.

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Authors and Affiliations

  1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Laure-Marie Grand, Sara J. Palmer & Ray L. Frost

  2. ENSICAEN, 6 Boulevard Marechal Juin, 14050, Caen Cedex 4, France

    Laure-Marie Grand

Authors
  1. Laure-Marie Grand
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  2. Sara J. Palmer
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  3. Ray L. Frost
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Correspondence to Ray L. Frost.

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Grand, LM., Palmer, S.J. & Frost, R.L. Synthesis and thermal stability of hydrotalcites based upon gallium. J Therm Anal Calorim 101, 195–198 (2010). https://doi.org/10.1007/s10973-009-0456-y

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  • DOI: https://doi.org/10.1007/s10973-009-0456-y

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