Combustion and emission characteristics of a HCCI engine fuelled with n-butanol-gasoline blends

► The HCCI operation was achieved on an engine fuelled with n-butanol-gasoline blends. ► The autoignition of the fuels advances with increasing n-butanol volume fraction. ► Aldehydes were significantly increased with n-butanol concentration in the blends. ► Combustion duration decreases with n-butanol volume fraction in the blends. ► The application of n-butanol results in ethanol emissions.