Systematic study of the effect of the hydroxyl functional group in alcohol molecules on compression ignition and exhaust gas emissions

The effect of cetane number and oxygen content in the performance and emissions characteristics of a diesel engine using biodiesel blends

“…In the last two decades there has been a growing interest in higher-level alcohols because of their high energy levels, higher cetane numbers, better blend stability, less hygroscopic tendencies, increased carbon chain length and improved ignition quality of the alcohol fuel molecules (Koivisto et al, 2015), compared with the lower alcohols such as ethanol and methanol. Alcohols are classified under oxygenated fuels with a hydroxyl group.…”

The influence of various oxygenated functional groups in carbonyl and ether compounds on compression ignition and exhaust gas emissions

“…The assessment includes the impact of altering the position 97 of the carbonyl group in a molecule and the level of carboxylic acid 98 unsaturation. A comparison is then made of the results from these 99 molecules and those of the several alcohol molecules from a previ-100 ous companion study [12]. It is suggested in the paper that two key 101 aspects to understanding how molecular structure affects ignition 102 delay are the relative difficulty of hydrogen abstraction from the 103 fuel molecule and the subsequent ability of the fuel peroxy radical 104 to isomerize through hydrogen transfer [13,14].…”

Transesterification of high-acidity spent coffee ground oil and subsequent combustion and emissions characteristics in a compression-ignition engine

“…All the experiments were conducted with the test fuels maintained at ambient conditions (∼30°C), except for the raw coffee oil which was heated to 45°C to avoid solidification. Previous studies have reported that a rise in temperature up to 38°C caused only a small decrease in the ignition delay that was of low significance [35,36].…”