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Analysis of the oxidative stability of a diesel-biodiesel fuel mixture when different antioxidants are added.

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2026 ASABE Annual International Meeting  2600144.(doi:10.13031/aim.202600144)
Authors:   Carolina Silva Ribeiro, Ronald Leite Barbosa, Carlos Eduardo Silva Volpato
Keywords:   B15 diesel; oxidative stability; biodiesel; antioxidants; induction period.

Abstract. The incorporation of biodiesel into mineral diesel increases the fuel's susceptibility to oxidative degradation due to the presence of unsaturated fatty esters. In this context, the present work evaluated the influence of different commercial antioxidants on the oxidative stability of B15 diesel. Four commercial additives, named additive A, additive B, additive C, and additive D, were studied at recommended concentrations and under overdose conditions. Oxidative stability was determined using a Scavini instrument and a methodology based on ASTM D525, by monitoring the induction period under a pressurized oxygen atmosphere. The B15 fuel without additives showed an average induction period of 452 ± 2.6 min. Additive A showed the best antioxidant performance, reaching induction periods of 476 ± 3.4 min and 480 ± 2.7 min at concentrations of 2.0 mL/L and 3.5 mL/L, respectively, corresponding to gains of up to 6.2% compared to the fuel without additives. Additives B, C, and D showed induction periods shorter than the base fuel, indicating lower antioxidant efficiency under the evaluated conditions. The results demonstrated that the oxidative stability of B15 diesel depends directly on the chemical composition and concentration of the additive used. Furthermore, it was found that increasing the concentration did not guarantee improved oxidative stability for all products evaluated. The low standard deviations observed indicated good experimental repeatability of the method employed.

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