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Controlled rate thermal analysis of sepiolite

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Abstract

Controlled rate thermal analysis (CRTA) technology offers better resolution and a more detailed interpretation of the decomposition processes of a clay mineral such as sepiolite via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. Constant-rate decomposition processes of non-isothermal nature reveal changes in the sepiolite as the sepiolite is converted to an anhydride. In the dynamic experiment two dehydration steps are observed over the ~20–170 and 170–350 °C temperature range. In the dynamic experiment three dehydroxylation steps are observed over the temperature ranges 201–337, 337–638 and 638–982 °C. The CRTA technology enables the separation of the thermal decomposition steps.

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Acknowledgements

This research was supported by the Hungarian Scientific Research Fund (OTKA) under Grant No. K62175. The financial and infra-structure support of the Queensland University of Technology Inorganic Materials Research Program is gratefully acknowledged. One of the authors (LMD) is grateful to the CRC for polymers for a Masters scholarship.

Author information

Authors and Affiliations

  1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Ray L. Frost

  2. Department of Analytical Chemistry, University of Pannonia, PO Box 158, 8201, Veszprem, Hungary

    János Kristóf

  3. Department of Environmental Engineering and Chemical Technology, University of Pannonia, PO Box 158, 8201, Veszprem, Hungary

    Erzsébet Horváth

Authors
  1. Ray L. Frost
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  2. János Kristóf
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  3. Erzsébet Horváth
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Correspondence to Ray L. Frost.

Appendix

Appendix

Calculation of water content for Sepiolite, Nevada

  • Composition: Mg4Si6O15(OH)2 · xH2O

  • Removing water up to 347 °C: 20.30 mg that is 1.127 mmol

  • Remaining dehydrated mineral up to 347 °C: 132.01 mg that is 0.245 mmol

  • Molar mass of dehydrated mineral: 539.80 g mol−1

  • Calculation of x:

    • 1 mol dehydrated mineral—x mol H2O

    • 0.245 mol dehydrated mineral—1.127 mol H2O

    • x = 4.6–5 mol

  • Formula: Mg4Si6O15(OH)2 · 5H2O

  • Steps of water liberation according to the decomposition steps up to 347 °C:

    1. 1.

      step: 3.45 mol

    2. 2.

      step: 1.15 mol

Calculation of water content for Sepiolite, Nairobi

  • Composition: Mg4Si6O15(OH)2 · xH2O

  • Removing water up to 352 °C: 26.40 mg that is 1.465 mmol

  • Remaining dehydrated mineral up to 352 °C: 170.49 mg that is 0.316 mmol

  • Molar mass of dehydrated mineral: 539.80 g mol−1

  • Calculation of x:

    • 1 mol dehydrated mineral—x mol H2O

    • 0.316 mol dehydrated mineral—1.465 mol H2O

    • x = 4.63–5 mol

  • Formula: Mg4Si6O15(OH)2 · 5H2O

  • Steps of water liberation according to the decomposition steps up to 352 °C:

    1. 1.

      step: 3.53 mol

    2. 2.

      step: 1.10 mol

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Frost, R.L., Kristóf, J. & Horváth, E. Controlled rate thermal analysis of sepiolite. J Therm Anal Calorim 98, 749–755 (2009). https://doi.org/10.1007/s10973-009-0201-6

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  • DOI: https://doi.org/10.1007/s10973-009-0201-6

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