Journal of Food, Agriculture and Environment

The oxidative stability of soybean biodiesel in the presence of iron and copper


Daniela Martins Trindade *, Reinaldo Aparecido Bariccatti, Samuel Nelson, Melegari de Souza, Kátia Andressa Santos, Edson Antonio Silva, Carlos Eduardo Camargo Nogueira, Helton Aparecido Rosa, Alessandra Zucunelli Farias

Recieved Date: 2015-10-11, Accepted Date: 2015-12-28


Biodiesel is a leading biofuel due to its ability to partially or totally replace diesel, with the advantage of being a renewable fuel. However, it is subject to oxidative degradation. Therefore, the study of the oxidative stability of biodiesel is very important for its technological development. Oxidative degradation occurs due to the action of the air, light, temperature and humidity. This action is accelerated when biodiesel is exposed to high temperatures or catalysts. The goal of this work was to study the stability of biodiesel produced from soybean vegetable oil. For the analysis of the stability of the biodiesel, the samples were subjected to thermal stress in an oven, at 130ºC. The acidity index coupled with UV-Vis and infrared spectroscopic techniques was used to monitor the level of oxidation of biodiesel. The catalytic effect of metals in the oxidation reaction of soybean biodiesel was also addressed, comparing the effects of the presence and the absence of metals. The acidity index of soybean biodiesel increased with the thermal stress exposure time. There was also an increase of 32.1% and 60.7% in the acidification speed in the presence of iron and copper, respectively. Analyzes from the UV-Vis and infrared spectra indicated the generation of oxidation products. Changes in the UV-Vis and infrared spectra of soybean biodiesel were smaller compared to soybean biodiesel contaminated with metals, thus indicating the catalytic effect of these metals.


Renewable sources, spectroscopy, oxidation

Journal: Journal of Food, Agriculture and Environment
Year: 2016
Volume: 14
Issue: 1
Category: Environment
Pages: 119-123

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