Improving oxidation stability and NOX reduction of biodiesel blends using aromatic and synthetic antioxidant in a light duty diesel engine

Performance and emissions of a diesel engine using sunflower biodiesel with a renewable antioxidant additive from bio-oil

“…Small differences were observed in the values of this parameter working with different fuels. Petroleum-derived diesel (D) produced the highest power at the lowest engine speeds (1500-2500 rpm), which was in agreement with the results found by other authors [30,31]. The differences observed between the different fuels were small and can be attributed to slight differences in density, kinematic viscosity and calorific values.…”

“…The calculated value of BSFC for DSB was about 1% higher than the one for SB, as a result of a slightly lower heating value in the presence of the phenolic antioxidant additive from bio-oil. The opposite trend has been observed by other authors using synthetic antioxidants composed of phenols, such as BHT and 2,2′-methylenebis (4-methyl-6-tert-butylphenol) (MBEBP) [33], and amines, such as DPPD [18], NPPD [13,31], EDA, and PPDA [12]. The reduction in specific fuel consumption was attributed to the friction reduction properties of such antioxidants in the fuel injection system.…”

“…NO x formation was slightly reduced by 0.1 g/kW·h when SB was treated with the antioxidant additive obtained from bio-oil solvent extraction (DSB). Rashed et al [31] suggested that the reaction between molecular nitrogen and hydrocarbon free radicals (CH, C 2 , C and CH 2 ) plays a role on prompt NO x emission during the combustion of biodiesel. Antioxidants can act as radical quenching agents and, therefore, diminish NO x formation.…”

“…Ramalingan et al [19] obtained the same results with the addition of an antioxidant additive obtained from Pongamia pinnata leaves to a B20 blend (Calophyllum oil). The addition of NPPD, DPPD and EHN to B20 blends (Calophyllum inophyllum biodiesel) also produced a decrease in smoke intensity [31]. Nevertheless, other authors observed an increase in the smoke production using antioxidant additives such as DPPD [47], BHA and BHT [17], but still below the diesel level.…”

Antioxidative potential of Phyllanthus emblica for oxidation stability of biodiesels

“…However, thermogravimetric analysis of study indicated that the most stable extract was basil, followed by rosemary and oregano. Rashed et al [12] presented the experimental evaluation of OS and emission of a diesel engine fuelled by calophyllum biodiesel treated with antioxidant additives DPPD, NPPD, and EHN. The study examined that there was a significant increase in OS and a decrease in exhaust NO x emissions after adding an antioxidant to CIB20 blends.…”