Abstract
The novelty of this study is that it presents the first in-depth evaluation of the kinetic triplet and thermodynamic parameters from the pyrolysis of açaí seed (Euterpe oleracea), which is the main biowaste from the açaí fruit processing industry. First, the physicochemical characteristics of the açaí seed, i.e., the proximate analysis, ultimate analysis, energy content, bulk density, and bioenergy density, were determined. Thermogravimetric experiments were then conducted to evaluate the pyrolysis characteristics of the açaí seed, the kinetic triplet (Ea, A, and f(α)), and the thermodynamic parameters (ΔH, ΔS, and ΔG). Three pseudo-components were distinguished from the açai seed pyrolysis profile using the asymmetric double sigmoidal (Asym2sig) function, which was described by the reaction model for the first order, third order, and eighth order, respectively. The Vyazovkin isoconversional method showed values of Ea ranging from 103 to 346 kJ mol−1 for açaí seed pyrolysis. The kinetic expression was applied to reconstruct the experimental data used (R2 > 0.9210) for the kinetic study and validated with a different experimental condition. The statistical test indicated no significant difference between experimental and calculated curves; therefore, the kinetic parameters are applicable to different thermal conditions. Physicochemical properties and thermodynamic parameters suggested that the açaí seed is a good candidate for bioenergy conversion through pyrolysis. Açaí seed is a promising feedstock for bioenergy production, as demonstrated by the kinetic and thermodynamic findings, and this information is important for advancing the design and scale-up of an açai seed pyrolysis process.
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Acknowledgments
The authors are grateful for the financial support given by the Brazilian Council for Scientific and Technological Development (CNPq/Brazil Process 423869/2016-7) and Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil Finance Code 001). The authors would also like to acknowledge LCA/UFPB and LabMaq/UFPB for providing the infrastructure that was required to carry out this study.
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Highlights
• Açaí seed is an abundant (193 kt year−1) and underutilized residual biomass in Brazil.
• First detailed attempt to evaluate the açaí seed’s feasibility as feedstock for pyrolysis.
• Açaí seed has a remarkable bioenergy potential due to its physicochemical properties.
• Deconvolution was successfully applied for kinetic evaluation of açaí seed pyrolysis.
• The endothermic and favorable natures for bioenergy were observed by thermodynamic analysis.
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Alves, J.L.F., Da Silva, J.C.G., Di Domenico, M. et al. Exploring Açaí Seed (Euterpe oleracea) Pyrolysis Using Multi-component Kinetics and Thermodynamics Assessment Towards Its Bioenergy Potential. Bioenerg. Res. 14, 209–225 (2021). https://doi.org/10.1007/s12155-020-10175-y
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DOI: https://doi.org/10.1007/s12155-020-10175-y