Caffeic Acid: An Efficient Antioxidant for Soybean Biodiesel Contaminated with Metals

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• 作者：Nataly A. Santos ; Sarah S. Damasceno ; Pedro H. M. de Arau虂jo ; Vero虃nica C. Marques ; Raul Rosenhaim ; Valter J. Fernandes ; Jr. ; Neide Queiroz ; Ieda M. G. Santos ; Ary S. Maia ; Anto虃nio G. Souza
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：September 15, 2011
• 年：2011
• 卷：25
• 期：9
• 页码：4190-4194
• 全文大小：775K
• 年卷期：v.25,no.9(September 15, 2011)
• ISSN：1520-5029

文摘

Phenolic compounds are widely recognized because of their antioxidant capacity. In the present work, caffeic acid was shown to minimize the formation of oxidative radicals in soybean biodiesel, according to the induction period (IP) obtained by the Rancimat method. Its efficiency was much higher than usual antioxidants, such as butylated hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ). With a decomposition temperature of 170 掳C, caffeic acid retained its properties, showing excellent antioxidant activity even when subjected to accelerated oxidation tests. While contamination with metals led to a meaningful decrease of the oxidative stability of soybean biodiesel, when small amounts of caffeic acid (500 mg L^鈥?) were also present in the fuel, IP values higher than 6 h were obtained, reaching the limit specified by EN 14214.