The Catalytic Action of Copper Ions and the Rosemary Extract Antioxidant Effect in the Biodiesel Oxidation Reaction and the Implication in Arrhenius Behavior

Abstract

Biodiesel contains esters in its composition which make it susceptible to oxidation. Among the factors that cause this reaction is the contamination with metal ions. In the present work, it was analyzed biodiesel samples obtained from a mixture containing 39.0% m/m soybean oil, 22.0% m/m beef tallow and 39.0% m/m poultry fat using a methyl route. Copper ions were added to the biodiesel to evaluate its catalytic action in the oxidation reaction, in the presence and absence of rosemary extract. During 192 h of assay, samples containing copper, without extract, showed shorter induction periods, higher rate constants and lower activation energy, when compared to samples containing extract, at the same assay temperature. Copper ions presented a strong catalytic action causing linearity deviations showing a super-Arrhenius behavior, while rosemary extract delayed the oxidative process and showed no linearity deviations.

Study of the thermal behavior of rosemary extract and its temperature‐related antioxidant effect on chicken fat

“…RE group presents a linear behavior with a slight concave (R 2 = 0.99), in contrast, a distinct deviation in the control group (R 2 = 0.97) shows a super‐Arrhenius behavior in which activation energy declines with temperature (data not shown). The deviation reveals that the oxidation reactions in the control group are more complex and erratic, while RE can capture different kinds of alkyl and alkoxy radicals and consequently eliminate the variation in oxidation products (Spacino et al, 2020; Yang et al, 2016).…”