A comparative analysis on emissions of some next generation long-chain alcohol/diesel blends in a direct-injection diesel engine

In this experimental study, the effect of using long-chain alcohols (pentanol and 2-ethyl 1-hexanol) on the emissions were studied and discussed, by comparing the emissions results with diesel fuel. 10% pentanol and 10% 2-ethyl 1-hexanol were separately added into 90% diesel fuel which namely as PE10 and HE10, respectively. The tests were performed at full-throttle valve opening and constant engine speed of 1800rpm. The exhaust emissions of diesel engine fuelled with DF, PE10 and HE10 were studied under varies engine loads (0%, 25%, 50%, 75% and 100%). The results showed that the use of alcohols fuels affects carbon monoxide (CO) emission to increase as well as hydrocarbon (HC). In addition, decreased nitrogen oxides (NO_x) and carbon dioxide (CO₂) were observed. Moreover, it is noted that 2-ethyl 1-hexanol is a better additive than pentanol due to lower CO, HC and NO_x measured in HE10.