| Summary: | Growing demand of fuel in daily life and its risk cause serious problem for this globe. Serious attention is required to see this problem. In this review article there is a comparative study to find out the effects of additives for biodiesel fuel and efforts to recover the combustion and performance and to diminish the emissions. By using biodiesel, there are most disadvantages such as higher density, lesser heating value, high fuel consumption and high oxides of nitrogen. To avoid above disadvantages, the fuel additives help in playing a very important role in minimizing the drawbacks of biodiesel and in maintaining international fuel standards. Additives can be considered toward to improve combustion, fuel economy and to decrease the emissions. Many different types of additives are applied in biodiesel to meet the specification standards and to recover the quality of biodiesel. The metal based additives, cetane number additives, antioxidant additives and oxygenated additives help in improving the quality of the biodiesel. From this literature review, the effects of additive on biodiesel are explained. The reviews conclude that the uses of additive to the 2nd generation of biodiesel are the best in improving the combustion performance and emission reduction. Keywords: Biodiesel, Additives, Performance, Combustion, Emissions
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