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Synthesis of biodiesel catalyst CaO·ZnO by thermal decomposition of calcium hydroxyzincate dihydrate CaZn2(OH)6·2H2O: kinetic studies and mechanisms

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Abstract

In this contribution, we are presenting the study of structural and thermal decomposition kinetics of synthesized calcium hydroxyzincate dihydrate CaZn2(OH)6·2H2O (CZO). The characterization of the prepared and calcined precursors was done by X-ray diffraction and Fourier Transform Infrared techniques and indicates that CZO exhibits a monoclinic structure with space group P2 1 /c. Calcining this material at 200 °C leads to a heterogeneous mixture composed of ZnO, Ca(OH)2, and an amorphous Zn(OH)2. When the temperature is >400 °C, only ZnO and CaO phases were detected by XRD analysis. The thermal decomposition kinetics of CZO was evaluated by thermogravimetry and derivative thermogravimetry in N2 atmosphere under non-isothermal conditions. The kinetic parameters such as the activation energy (E α ) and reaction model (f(α)) revealed the complex nature of the decomposition process, consisting of several steps. The separation of overlapped peaks was performed by applying the Fraser–Suzuki procedure to the experimental DTG data and the activation energy was then calculated for each individual peak by Friedman method confirming the fair single-step mechanism of the first three processes. On the basis of kinetic results, a thermal decomposition mechanism of CZO material has been proposed and correlated to structural nature and stability of the resulting phases. The CaO∙ZnO based catalyst is formed according to a limited nucleation and growth mechanism at low temperatures and three complex processes occur afterwards when the structure cleaves.

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Acknowledgments

This research was financially supported by University of Mohammed V- Morocco under the Project No. SCH 04/09 and Hassan II Academy of Science and Technology, Morocco.

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Authors and Affiliations

  1. Laboratory of Physical Chemistry of Materials, Catalysis and Environment (CNRST-URAC26), Department of Chemistry, Faculty of Sciences, University of Mohammed V, BP:1014 RP, Rabat, Morocco

    Fatiha Ouanji, Mariam Khachani, Said Arsalane, Mohammed Kacimi, Mohammed Halim & Adnane El Hamidi

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  1. Fatiha Ouanji
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  2. Mariam Khachani
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  3. Said Arsalane
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  4. Mohammed Kacimi
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  5. Mohammed Halim
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  6. Adnane El Hamidi
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Correspondence to Adnane El Hamidi.

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Ouanji, F., Khachani, M., Arsalane, S. et al. Synthesis of biodiesel catalyst CaO·ZnO by thermal decomposition of calcium hydroxyzincate dihydrate CaZn2(OH)6·2H2O: kinetic studies and mechanisms. Monatsh Chem 147, 1693–1702 (2016). https://doi.org/10.1007/s00706-016-1671-4

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  • DOI: https://doi.org/10.1007/s00706-016-1671-4

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