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Antioxidants are additives for the prevention of the degradation of biofuels. This study evaluated the oxidative stability of B100 biodiesel from soybean oil with the addition of three synthetic antioxidants, butylhydroxyanisole (BHA), tertbutyl-hydroquinone (TBHQ) and butylated hydroxytoluene (BHT), either pure or mixed, according to the simplex–centroid mixture design. The obtained kinetic parameters indicated that the addition of the three pure antioxidants and a ternary mixture of the antioxidants resulted in an induction period that was greater than that of the control sample. Furthermore, based on the induction period ( ip ), the antioxidant BHT was the most efficient in preventing the oxidation of the B100 biodiesel used.

Antioxidants are an alternative to prevent or retard biofuel degradation. This study assessed the oxidative stability of biodiesel B100, made from soybeans, in the presence of three synthetic antioxidants, butylhydroxyanisole (BHA), terbutylhydroquinone (TBHQ) and butylhydroxytoluene (BHT), pure or in mixture, from the simplex-centroid design. Results revealed that when the three oxidants were employed separately, as well as the ternary mixture, they presented induction period over 6 h, at 110 °C, being in accordance with specifications of the norm EN1412. Besides that, depending on the temperature, the BHA, TBHQ and BHT oxidants act in different ways, highlighting that BHA and TBHQ presented higher efficiency in the prevention of the oxidative process of the biofuel B100.