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Kinetic Aspect of Thermal Decomposition of Natural Phosphate and its Kerogen. Influence of heating rate and mineral matter

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Abstract

The natural phosphate and its demineralization products from Moroccan deposit were pyrolysed in a thermogravimetric analyser (TG) to examine the influence of the heating rate and mineral matter on their thermal decomposition. The heating rates investigated in the TG were 5–100°C min−1 to final temperature of 1200°C. The integral method was used in the analysis of the TG to determine the kinetic parameters. It has been found that for the natural phosphate and corresponding kerogen analysed in the TG, the increase of the heating rate shifts the maximum rate loss to higher temperature. A first order reaction was found to be adequate for pyrolysis in the range 150–600°C which was attributed to kerogen decomposition. In addition, the results indicate that the removal of mineral matter affected the kinetic parameters found for kerogen in the natural phosphate.

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Authors and Affiliations

  1. Laboratoire de Chimie-Physique, Faculté des Siences Semlalia de Marrakech, Université Caddy Ayyad, BP 3090, 40001, Maroc

    A. Aouad, L. Bilali, M. Benchanâa & A. Mokhlisse

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  1. A. Aouad
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  2. L. Bilali
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  3. M. Benchanâa
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  4. A. Mokhlisse
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Correspondence to M. Benchanâa.

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Aouad, A., Bilali, L., Benchanâa, M. et al. Kinetic Aspect of Thermal Decomposition of Natural Phosphate and its Kerogen. Influence of heating rate and mineral matter. Journal of Thermal Analysis and Calorimetry 67, 733–743 (2002). https://doi.org/10.1023/A:1014329526885

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