Artigo:

Diesel commercialized in Brazil has a mandatory addition of biodiesel (B100). Currently, the volumetric biodiesel percentage in the blend diesel/biodiesel is 10%, increasing to 11% in June/2019. The B100 percentage in diesel will rise 1% per year, reaching 15% in 2023. The B100 addition in diesel in increasing percentages has been a cause for concern. Although they have similar characteristics, B100 is more prone to oxidation than diesel. This work studied the effect of B100 on the thermal behavior of diesel/biodiesel blends using thermal analysis. Blends were prepared using biodiesel/S10 diesel, in volumetric percentage of 10%, 15%, 20%, 25%, 30%, 35%, 40% and 50%, and analyzed in a DSC-TGA. The results indicate that the interaction between these two fuels depend on the B100 amount in the blend which reflects in the TG/DTG graph profile. It was also observed that the increase of B100 content shift the mass loss stages of the blends to higher temperatures. As a result, there is a displacement of the onset volatilization temperature and decomposition temperature if compared to diesel. The Tonset/°C to diesel is 123 ºC while for the B25 is 140 ºC. The Tendset/°C for diesel and B25 are 235 ºC and 245 ºC respectively. This behavior is more pronounced the higher is B100 content.