▎ 摘　　要

In the present study, graphene nanobiodiesel was prepared by dispersing of graphene in Simarouba methyl ester (SME) blend with diesel. Dispersion was characterized with ultraviolet-visible (UV-Vis) spectrometry. The performance and emission characteristics of graphene nanobiodiesel were carried out on a single-cylinder, water-cooled, direct injection, four-stroke computerized diesel engine. The characteristics are measured for 3 different dosing levels of graphene nanoparticle. It resulted in improved brake thermal efficiency by 9.14%, reduction in unburnt hydrocarbon (HC) by 15.38%, carbon monoxide (CO) by 42.855 and oxides of nitrogen (NOx) emission by 12.71% with SME2040. Also the addition of graphene nanoparticles has resulted in a significant reduction in the combustion duration and a marginal increase in peak cylinder pressure at all operational loads.