Abstract
Biodiesel is a renewable alternative to diesel which is used in transportation and industrial sectors. However, it is more susceptible to oxidation compared to diesel hence the use of antioxidants is proposed to enhance its oxidation stability. This paper aims to provide a concise perspective on the influencing factors in the use of commonly reported antioxidants for biodiesel oxidation stability enhancement. The scope here covers the type of antioxidant, concentration of antioxidant, biodiesel blend, storage time and temperature, with focus on the implications on palm biodiesel oxidation stability over an extended period. Data analysis suggests the order of effectiveness of synthetic antioxidants to be TBHQ > PY > PG > BHT ≥ BHA while for natural antioxidants, the order is quercetin ≥ curcumin > α-tocopherol. A higher applied antioxidant concentration generally results in higher IP extension though the relationship is not directly proportional. Further work can investigate the threshold of antioxidation activity with increasing concentration. Increasing the blend ratio enable the possibility of reducing antioxidant cost, but this would not be a major influencing factor unless the practice of adding antioxidant first prior to blending changes. The storage time is a major influencing factor in the context of stored biodiesel used as a backup energy source. At least 6 months to 1 year is recommended for such tests. Temperature affects the thermodynamics and kinetics of antioxidants performance. More studies on this for palm biodiesel are recommended for comparison and elucidation of the underlying mechanisms.
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Acknowledgements
The Ministry of Higher Education (MOHE), Malaysia is gratefully acknowledged for the funding of this project under the Fundamental Research Grant Scheme FRGS/1/2020/TK02/UNIM/01/1. The Malaysian Palm Oil Board (MPOB) is also thanked for the provision of facilities and technical support.
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Lau, C.H., Gan, S., Lau, H.L.N., Lee, L.Y., Thangalazhy-Gopakumar, S. (2023). A Perspective on the Influencing Factors in the Use of Antioxidants for Biodiesel Oxidation Stability Enhancement. In: Kim, J., Chen, Z. (eds) Trends in Environmental Sustainability and Green Energy. CGEEE 2022. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-27803-7_9
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