A novel application of Mangifera indica L and Eugenia uniflora L extracts as antioxidants to control biodiesel oxidation stability

Abstract

AbstractThe present research aims to evaluate the effect on the stability of biodiesel during the storage period at 60°C and at low temperatures of the antioxidants from extracts of mango (biodiesel with extracts of mango), pitanga (biodiesel with extracts of pitanga) added at concentrations of 500, 2000, 4000 and 8000 parts per million to soybean biodiesel. All samples were characterized by the tests of acid value, kinematic viscosity, cloud point, pour point, pour point, cold filter plugging point and Fourier transform infrared (FTIR). Through the FTIR, it was observed that the CH and OH regions showed greater intensity for the non‐additive biodiesel (B100) in relation to the additive Biodiesel, which shows the antioxidant effect of the additives on the oxidative stability of biodiesel. The effect of the extracts on thermo‐oxidative stability follows the sequence: mango leaf extracts > pitanga leaf extracts > B100 after 504 h and at the low temperature the effect of antioxidant following sequence: pitanga extract > mango extract > B100 showing the effect of the antioxidant additives of leaf extracts on the stability of soybean biodiesel at regions of high and low temperatures. The mango and pitanga leaves extracts, are very promising as green antioxidant for biodiesel because it allows the longest storage time without deteriorating.