Impact of oxyfunctionalized turpentine on emissions from a Euro 6 diesel engine.

Turpentine, a mixture of terpenes obtained as a product from oleoresin distillation or as a side product from paper industry, can contribute to the production of oxygenated fuels from renewable sources with properties different from normal alcohols or typical esters. In the present work, the product of turpentine oxyfunctionalization (oxyturpentine), which is composed mainly of nopol, α-terpineol and α-pinene, is evaluated as diesel fuel component blended at 20% vol., by measuring the performance and emissions of a Euro 6 engine under a standard driving cycle. The results show a reduction in particulate number, particulate matter and nitrogen oxides (the tightest emissions from diesel engines), while carbon monoxide and hydrocarbon emissions were increased. The emissions were influenced by the fuel properties and the changes in equivalence ratio and the EGR in the engine (derived from the fuel properties). These results show a high potential of oxyturpentine to be used as component of diesel fuel. • The oxyturpentine content affects both the EGR and the equivalence ratio in the engine. • NOx was decreased when diesel engine was fueled with diesel + oxyturpentine blend. • Oxygen content of oxyturpentine reduces particle mass and particle number emissions. • At cold-engine conditions, hydrocarbon and carbon monoxide emissions increased sharply. [ABSTRACT FROM AUTHOR]