Focke, Walter WilhelmVan der Westhuizen, IsbeLofte Grobler, A.B.Nshoane, Khomotso T.Reddy, Judy K.Luyt, Adriaan S.2012-04-162012-04-162012-04Walter W Focke, Isbe van der Westhuizen, AB Lofte Grobler, Khomotso T Nshoane, Judy K Reddy & Adriaan S Luyt, The effect of synthetic antioxidants on the oxidative stability of biodiesel, Fuel, vol. 94, pp. 227–233 (2012), doi: 10.1016/j.fuel.2011.11.061.0016-23611873-7153 (online)10.1016/j.fuel.2011.11.061http://hdl.handle.net/2263/18586Biodiesels were prepared using base catalyzed methanolysis of sunflower, soybean and canola oils. Rancimat oxidative stability measurements showed that the induction period (IP) for neat canola biodiesel conformed to EN 14214, the European specification for biodiesel (IP > 6 h). Stability was enhanced when 0.5 wt.% of the synthetic antioxidants di-tert-butylhydroquinone (DTBHQ) or poly(1,2-dihydro- 2,2,4-trimethylquinoline) (Orox PK) was added. Soybean-based biodiesel spiked with 0.5 wt.% DTBHQ also reached this specification. Orox PK improved the stability of sunflower biodiesel but the 3 h induction period specified by ASTM D-6751 could not be reached. Curiously, canola biodiesel was destabilized on adding the antioxidant Naugard P (tris(nonylphenyl) phosphite).en© 2011 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, vol. 94, pp. 227–233 (2012), doi: 10.1016/j.fuel.2011.11.061.Oxidation induction timeOxidative stabilityRancimat methodBiomass energyBiodiesel fuelsAntioxidantsSoy oilCanola oilSunflower seed oilVegetable oils as fuelPostprint Article