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Thermal behavior and pyrolysis kinetics of olive stone residue

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Abstract

In the last decades, one of the most ordinary challenges that countries of Southern Europe face is the management of wastes and by-products of olive oil production activities which are disposed into the environment and contribute to the enhancement of major ecological issues due to their organic loads. Exploitation of these olive residues wastes by thermochemical treatment has been proved a very popular way to generate a wide range of valuable products. In this concept, this work studies the thermal decomposition process of olive stone samples using thermogravimetric analysis (TGA) data obtained under inert atmosphere at various heating rates (5–20 °C) and their kinetic analysis conducted via model-free and model fitting methods. The changes in the crystal structure for various pyrolysis temperatures of the sample were examined by X-ray diffraction analysis (XRD), while the morphological characteristics were examined by scanning electron microscopy (SEM). Results indicated that the thermal behavior of olive stone sample was a typical one for a lignocellulosic material with the first mass loss being attributed to moisture removal while the following stages were assigned to lignocellulosic degradation substances. Vyazovkin (VYA) isoconversional method was performed to estimate effective activation energy (Ea) and the pre-exponential factor, while using a model fitting method the best fitting results were obtained by a three independent parallel reactions model, obeying the nth order with Fn code and described by the f(α) = (1 − α)n equation.

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Acknowledgements

The author would like to thank Pharmagnose S.A. (Athens) for collaboration and supply of olive stone samples. Funding was provided by GSRI (Grant No. Project Code: T6YBΠ- 00161).

Funding

This research has been co-financed by the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation, under the call Special Actions AQUACULTURE-INDUSTRIAL MATERIALS-OPEN INNOVATION IN CULTURE (project code: T6YBΠ- 00161).

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  1. Advanced Materials and Devices Lab, School of Physics, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece

    T. Asimakidou & K. Chrissafis

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  1. T. Asimakidou
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  2. K. Chrissafis
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ΤΑ performed the experiments, material characterization measurements and evaluation. KC and TA wrote the paper. KC supervised the research study.

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Correspondence to T. Asimakidou.

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Asimakidou, T., Chrissafis, K. Thermal behavior and pyrolysis kinetics of olive stone residue. J Therm Anal Calorim 147, 9045–9054 (2022). https://doi.org/10.1007/s10973-021-11163-w

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  • DOI: https://doi.org/10.1007/s10973-021-11163-w

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