期刊
ENERGIES
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/en11123514
关键词
biodiesel; fatty acid methyl ester; free fatty acids; oxidation stability; antioxidant
资金
- Advanced Biomass R & D Center (ABC) of the Global Frontier Project - Ministry of Science and ICT [ABC-2015M3A6A2076483]
Oxidation of biodiesel (BD) obtained from the decomposition of biomass can damage the fuel injection and engine parts during its use as a fuel. The excess heating of vegetable oils can also cause polymerization of the biodiesel. The extent of BD oxidation depends on its fatty acid composition. In this study, an accelerated oxidation test of BDs at 95 degrees C was investigated according to ASTM D 2274 by applying a long-term storage test for 16 weeks. The density, viscosity, and total acid number (TAN) of BDs increased because of the accelerated oxidation. Furthermore, the contents of unsaturated fatty acid methyl esters (FAMEs), C18:2 ME, and C18:3 ME in BDs decreased due to the accelerated oxidation. The H-1-nuclear magnetic resonance spectrum of BDs that were obtained from the accelerated high temperature oxidation at 180 degrees C for 72 h differed from that of fresh BDs. The mass spectrum obtained from the analysis of the model FAME, linoleic acid (C18:2) methyl ester, which was oxidized at high temperature, indicated the formation of dimers and epoxy dimers of linoleic acid (C18:2) methyl ester by a Diels-Alder reaction.
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