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<p>In view of the dynamic nature of energy demands and the increasing of energy consumption, this study was conducted to analyze the thermal degradation properties of rubber shells (RS) and rubber cakes (RC) lignocellulosic biomasses. The aim of this study is to evaluate their pyrolytic performance for bioenergy production. Preliminary characterizations, including proximate analysis, EDX, SEM, FT-IR, <sup>13</sup>C NMR and XRD, were conducted to assess their suitability for pyrolysis. Proximate analysis revealed that RC has a high volatile content. In addition, thermo gravimetric analyses were performed at three heating rates (4, 8, and 16&#xa0;°C/min) in an inert environment. TGA analysis showed that the maximum devolatilisation temperature during the decomposition of both types of biomass is between 210 and 480&#xa0;°C. Kinetic and thermodynamic parameters of the activated complex formation were calculated using Vyazovkin models, differential method (Starink) and two isoconversion models: Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO). According to these approaches, the activation energy was determined to be 94.251 and 108.019&#xa0;kJ/mol, and 327.494 and 330.520&#xa0;kJ/mol for RS and RC, respectively. The Gibbs free energy results were 193.493 and 195.661&#xa0;kJ/mol, and 309.743 and 212.520&#xa0;kJ/mol, respectively. The values for the enthalpy change (ΔH) were 88.467 and 102.235&#xa0;kJ/mol, and 321.067 and 324.095&#xa0;kJ/mol for RS and RC, respectively. Coats-Redfern claims that the high R² values observed in models F, A, G and D suggest that biomass pyrolysis is the result of multiple sequential and/or concurrent processes rather than a single kinetic mechanism. Pyrolysis, which transitions from chemical to diffusive control, is therefore considered to be multi-mechanistic. This illustrates the inherent complexity and diversity of biomass. These results clearly demonstrate the significant potential of these biomasses for bioenergy production.</p>

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Non-isothermal thermo-kinetics and TGA study on reaction pathway and thermodynamic of lignocellulosic rubber tree core shells and cakes materials by thermal analysis

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Aliconne Maglace Etoukem,
  • Cyrille Ghislain Fotsop,
  • Donald Raoul Tchuifon Tchuifon,
  • Giscard Doungmo,
  • Richard Daris Tegaboue Nguedap,
  • Livie Blondèle Kenou Mekuete,
  • Paul Alain Nanssou Kouteu,
  • Anatole Guy Blaise Azebaze

摘要

In view of the dynamic nature of energy demands and the increasing of energy consumption, this study was conducted to analyze the thermal degradation properties of rubber shells (RS) and rubber cakes (RC) lignocellulosic biomasses. The aim of this study is to evaluate their pyrolytic performance for bioenergy production. Preliminary characterizations, including proximate analysis, EDX, SEM, FT-IR, 13C NMR and XRD, were conducted to assess their suitability for pyrolysis. Proximate analysis revealed that RC has a high volatile content. In addition, thermo gravimetric analyses were performed at three heating rates (4, 8, and 16 °C/min) in an inert environment. TGA analysis showed that the maximum devolatilisation temperature during the decomposition of both types of biomass is between 210 and 480 °C. Kinetic and thermodynamic parameters of the activated complex formation were calculated using Vyazovkin models, differential method (Starink) and two isoconversion models: Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO). According to these approaches, the activation energy was determined to be 94.251 and 108.019 kJ/mol, and 327.494 and 330.520 kJ/mol for RS and RC, respectively. The Gibbs free energy results were 193.493 and 195.661 kJ/mol, and 309.743 and 212.520 kJ/mol, respectively. The values for the enthalpy change (ΔH) were 88.467 and 102.235 kJ/mol, and 321.067 and 324.095 kJ/mol for RS and RC, respectively. Coats-Redfern claims that the high R² values observed in models F, A, G and D suggest that biomass pyrolysis is the result of multiple sequential and/or concurrent processes rather than a single kinetic mechanism. Pyrolysis, which transitions from chemical to diffusive control, is therefore considered to be multi-mechanistic. This illustrates the inherent complexity and diversity of biomass. These results clearly demonstrate the significant potential of these biomasses for bioenergy production.