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Due to the need to replace fossil diesel in automotive engines, there is a growing demand for renewable fuels. However, to propose new fuels to be used efficiently and also, without causing damage to the environment, many studies are done. In this sense, the present study aims to evaluate two renewable fuels - farnesane and soybeam biodiesel - using the analytical technique DSC (Differential Scanning Calorimetry) for determining the oxidative thermal degradation energy of these biofuels compared to fossil diesel (reference fuel for diesel engines). The importance of studying this parameter is due to the principle that the lower the energy of oxidative thermal degradation, the best feature of burning fuel. In addition, these fuels were also tested in diesel engine OM 926 LA Euro 5 using the ESC test - European Stationary Cycle in order to monitor their performance and emissions.

Biofuels have become an alternative to replace the fossil diesel in diesel engine. In this study, CO2 emissions and activation energies(Ea) have been determined for two renewable biofuels (farnesane and biodiesel), a fossil diesel and their blends. CO2 emissions were determined in an European Stationary Cycle (ESC) OM 926 LA Euro 5 diesel engine. Activation energies were determined by means of a mathematical model (Model Free kinetics) using experimental data from Thermogravimetric analysis. The result showed that the lowest values of both CO2 emissions and activation energies were obtained for farnesane/diesel blends when compared with biodiesel/diesel blends. CO2 emissions are described in this study as normalized values considering 100% of CO2 for pure fossil diesel and reduction of 7.5% and 1.9% were obtained for farnesane/diesel and biodiesel/diesel blends respectively. When farnesane was added to the diesel, a CO2 reduction of 7.5% was observed.

Biofuels and their blends with fossil fuel are important energy resources, which production and application have been largely increased internationally. This study focus on the development of a correlation between apparent activation energy (Ea) and NOx emission of the thermal decomposition of three pure fuels: farnasane (renewable diesel from sugar cane), biodiesel and fossil diesel and their blends. Apparent Activation energy was determined by using thermogravimetry and Model-Free Kinetics. NOx emission was obtained from the European Stationary Cycle (ESC) with OM 926LA CONAMA P7/Euro 5 engine. Results showed that there is a linear correlation between apparent activation energy and NOx emission with R2 of 0,9667 considering pure fuels and their blends which is given as: NOx = 2,2514Ea - 96,309. The average absolute error of this correlation is 2.96% with respect to the measured NOx value.