Effect of low CeO₂ nanoparticles dosage in biodiesel-blends on combustion parameters and toxic pollutants from common-rail diesel engine

The effect of toxic pollutants and combustion parameters from six-cylinder turbocharged common-rail diesel engine fueled with low CeO₂ nanoparticles dosage in biodiesel blends were investigated. Experiments were examined with four different test fuels under 50% engine load at a constant speed of 1800 rpm. The results indicated that the B15C15 significantly improves the in-cylinder pressure and heat release rate compared to other test fuels. In comparison with B0, the result showed a significant reduction in CO and HC emissions for biodiesel-CeO₂ blend fuels, along with a slight increase in NOx ranges between 2.78% and 19.01%. This reduction in unburned hydrocarbon inhibits the peak changes from nucleation mode to accumulation mode. In the meantime, accumulation mode particles decrease and the peak moves to the small particle size. Besides, B15C15 had a positive impact on organic compounds, which resulted in a 64.7% reduction of PAH emissions compared to B0. Whereas the emission factors of n-alkane such as dodecane, tetradecane and hexadecane, showed a negligible amount. However, the significant reduction of the respective concentration of OC and EC suggests that these compounds are either not formed as readily in combustion, or they are reduced effectively with biodiesel-CeO2 blend fuels.