Estimation of the storage time of biodiesel at room temperature in mixture with natural antioxidants and metallic ions: A semi-empirical study

Clemente, Marco Aurelio Jeanegitz; Branco, Isadora Guilherme; Romagnoli, Érica Signori; Filho, J. G. A. Pacheco; Mantovani, Ana Carolina Gomes; Chendynski, Letícia Thaís; Borsato, Dionísio

doi:10.1016/j.fuel.2023.129276

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…The evolution of IP via ASTM D4625 was consistent with aging at room temperature, according to other papers: in the current study, pure biodiesel IP varied from 5.9 to 2.5 h in 5 weeks, similar to drop from 5.5 to 2.9 h in 150 days; the reduction rate of pure biodiesel IP was 34% in 6 weeks, within the range of 12 to 46% in six months; in our work, IP of biodiesel with 50 mg/kg of TBHQ decreased from 9.0 to 7.3 h in 3 weeks, matching reduction observed with biodiesel containing 500 mg/kg of a green extract as additive in 90 days or, in 5 weeks (from 9.0 to 6.5 h), with biodiesel containing 3000 mg/kg of another green extract in 150 days (from 9.0 to 6.7 h); in the current study, when BHT was employed biodiesel IP lowered from 9.2 to 7.3 h in 5 weeks, like the reduction from 9.4 to 8.0 h in 150 days verified in ref . Furthermore, ASTM D4625 was considered more conservative than other procedures like what was conducted in ref , submitting biofuels to temperatures ranging from 110 to 125 °C. Data extrapolation was used to estimate storage time based on IP at 25 °C with biodiesel samples achieving 500 days.…”

Section: Results and Discussionsupporting

confidence: 90%

Kinetic Modeling of the Effect of Antioxidant Additives on Biodiesel Oxidation Stability

Souza,

d’Avila

2023

Ind. Eng. Chem. Res.

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Section: Results and Discussionsupporting

confidence: 90%

Kinetic Modeling of the Effect of Antioxidant Additives on Biodiesel Oxidation Stability

Souza,

d’Avila

2023

Ind. Eng. Chem. Res.

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Influence of antioxidants from pequi leaves on the thermal and oxidative stability of biodiesel

Irineu,

Silva,

Nogueira

et al. 2024

Biofuels Bioprod Bioref

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In this study, the efficacy of antioxidants found in pequi leaves was examined for safeguarding pequi biodiesel (EBP) against oxidation. The results reveal notable achievements. The antioxidant activity of AFP (a pequi leaf antioxidant additive) was assessed at various concentrations, demonstrating that as the concentration of AFP increases, the inhibition percentage significantly rises, reaching a remarkable inhibition of 99.12% at 100 mg L−1, with a calculated IC50 of 25.4 mg L−1. Additionally, the analysis of the AFP composition revealed the presence of terpenes and oxygenated compounds, which are well known for their antioxidant properties. Furthermore, the research emphasized the significance of thermogravimetric analysis in evaluating the thermal stability of additives, identifying critical temperatures at which AFP begins to protect biodiesel against oxidation (247.18°C) and the point at which its effectiveness may diminish (469.19°C). The EBP met quality standards regarding acidity, water content and density, but exhibited slightly lower oxidative stability compared with established standards. The correlation between the thermal degradation of biodiesel and the induction period highlighted the efficacy of AFP in mitigating thermal degradation. Nevertheless, it also indicated that maintaining biodiesel quality requires complementary approaches to minimize degradation over time.

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

Kahimbi,

Kichonge,

Kivevele

2024

Biofuels Bioprod Bioref

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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.

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Estimation of the storage time of biodiesel at room temperature in mixture with natural antioxidants and metallic ions: A semi-empirical study

Cited by 4 publications

References 27 publications

Kinetic Modeling of the Effect of Antioxidant Additives on Biodiesel Oxidation Stability

Kinetic Modeling of the Effect of Antioxidant Additives on Biodiesel Oxidation Stability

Influence of antioxidants from pequi leaves on the thermal and oxidative stability of biodiesel

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

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