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Kinetics and energetics of biodiesel oxidation stability: The impact of Uapaca kirkiana‐derived natural antioxidants.

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Title: Kinetics and energetics of biodiesel oxidation stability: The impact of Uapaca kirkiana‐derived natural antioxidants.
Authors: Kahimbi, Henry1,2 (AUTHOR), Kichonge, Baraka1,3 (AUTHOR), Kivevele, Thomas1 (AUTHOR) thomas.kivevele@nm‐aist.ac.tz
Source: Biofuels, Bioproducts & Biorefining. Mar2025, Vol. 19 Issue 2, p337-351. 15p.
Subject Terms: *Plant extracts, *Fruit skins, *Gibbs' free energy, *Arrhenius equation, *Fruit extracts
Abstract: Despite considerable progress in understanding biodiesel autoxidation inhibition, the kinetics and energetics of the inhibition reactions involving natural antioxidants remain underexplored. Most existing research on natural antioxidants has focused on enhancing oxidation stability and other fuel properties. This study aimed to investigate the oxidative stability of croton biodiesel (CBD) and assess the kinetics and energetics of natural antioxidants derived from the roots, pulp, and fruit peels of the Uapaca kirkiana plant. The oxidation stability of biodiesel samples was assessed using the OXITEST method at temperatures of 90, 100, 110, and 120 °C. These tests enabled the calculation of kinetic parameters such as reaction rates and activation energies, crucial for understanding the inhibition role of antioxidants during oxidative degradation. Activation energy for antioxidant consumption, determined using the Arrhenius equation, was found to be 81.39 kJ mol−1 for fruit peel extracts, 77.73 kJ mol−1 for pulp extracts, and 63.85 kJ mol−1 for root bark extracts. The higher activation energy for fruit peel extracts suggests that they are more effective at preventing oxidation, especially under high‐temperature conditions. Enthalpy, entropy, and Gibbs free energy parameters were calculated using the Eyring equation, indicating a nonspontaneous endothermic process for the antioxidant samples. The study found an inverse relationship between antioxidant concentration and rate constants, demonstrating the antioxidants' effectiveness in slowing down the oxidation process. These kinetics and energetics analyses provide detailed insights into how antioxidants function, facilitating the optimization, selection, and validation of their efficiency in stabilizing biodiesel. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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An: 183654207
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  Label: Title
  Group: Ti
  Data: Kinetics and energetics of biodiesel oxidation stability: The impact of Uapaca kirkiana‐derived natural antioxidants.
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  Data: <searchLink fieldCode="AR" term="%22Kahimbi%2C+Henry%22">Kahimbi, Henry</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kichonge%2C+Baraka%22">Kichonge, Baraka</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kivevele%2C+Thomas%22">Kivevele, Thomas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> thomas.kivevele@nm‐aist.ac.tz</i>
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  Data: <searchLink fieldCode="JN" term="%22Biofuels%2C+Bioproducts+%26+Biorefining%22">Biofuels, Bioproducts & Biorefining</searchLink>. Mar2025, Vol. 19 Issue 2, p337-351. 15p.
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  Data: *<searchLink fieldCode="DE" term="%22Plant+extracts%22">Plant extracts</searchLink><br />*<searchLink fieldCode="DE" term="%22Fruit+skins%22">Fruit skins</searchLink><br />*<searchLink fieldCode="DE" term="%22Gibbs'+free+energy%22">Gibbs' free energy</searchLink><br />*<searchLink fieldCode="DE" term="%22Arrhenius+equation%22">Arrhenius equation</searchLink><br />*<searchLink fieldCode="DE" term="%22Fruit+extracts%22">Fruit extracts</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Despite considerable progress in understanding biodiesel autoxidation inhibition, the kinetics and energetics of the inhibition reactions involving natural antioxidants remain underexplored. Most existing research on natural antioxidants has focused on enhancing oxidation stability and other fuel properties. This study aimed to investigate the oxidative stability of croton biodiesel (CBD) and assess the kinetics and energetics of natural antioxidants derived from the roots, pulp, and fruit peels of the Uapaca kirkiana plant. The oxidation stability of biodiesel samples was assessed using the OXITEST method at temperatures of 90, 100, 110, and 120 °C. These tests enabled the calculation of kinetic parameters such as reaction rates and activation energies, crucial for understanding the inhibition role of antioxidants during oxidative degradation. Activation energy for antioxidant consumption, determined using the Arrhenius equation, was found to be 81.39 kJ mol−1 for fruit peel extracts, 77.73 kJ mol−1 for pulp extracts, and 63.85 kJ mol−1 for root bark extracts. The higher activation energy for fruit peel extracts suggests that they are more effective at preventing oxidation, especially under high‐temperature conditions. Enthalpy, entropy, and Gibbs free energy parameters were calculated using the Eyring equation, indicating a nonspontaneous endothermic process for the antioxidant samples. The study found an inverse relationship between antioxidant concentration and rate constants, demonstrating the antioxidants' effectiveness in slowing down the oxidation process. These kinetics and energetics analyses provide detailed insights into how antioxidants function, facilitating the optimization, selection, and validation of their efficiency in stabilizing biodiesel. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/bbb.2711
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 337
    Subjects:
      – SubjectFull: Plant extracts
        Type: general
      – SubjectFull: Fruit skins
        Type: general
      – SubjectFull: Gibbs' free energy
        Type: general
      – SubjectFull: Arrhenius equation
        Type: general
      – SubjectFull: Fruit extracts
        Type: general
    Titles:
      – TitleFull: Kinetics and energetics of biodiesel oxidation stability: The impact of Uapaca kirkiana‐derived natural antioxidants.
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            NameFull: Kahimbi, Henry
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            NameFull: Kichonge, Baraka
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            NameFull: Kivevele, Thomas
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          Dates:
            – D: 01
              M: 03
              Text: Mar2025
              Type: published
              Y: 2025
          Identifiers:
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              Value: 1932104X
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              Value: 19
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              Value: 2
          Titles:
            – TitleFull: Biofuels, Bioproducts & Biorefining
              Type: main
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