NOx emissions of biodiesel as an alternative diesel fuel
by M. Canakci
International Journal of Vehicle Design (IJVD), Vol. 50, No. 1/2/3/4, 2009

Abstract: As an environmental friendly alternative fuel for compression-ignition (diesel) engines, fatty acid alkyl monoesters, commonly known as biodiesel, are produced from renewable feedstocks such as vegetable oils and animal fats. Without engine modification, when a diesel engine is fuelled with biodiesel, it provides significant reductions in particulate matter, carbon monoxide and unburned hydrocarbons compared with petroleum-based diesel fuel. In contrast to these reductions, many studies show that the use of biodiesel increases NO_x emissions, while only a few papers have reported no changes or reduction in NO_x emissions. Various arguments have been used in the literature to explain the increase in NO_x emissions when biodiesel is used. This study discusses the combustion characteristics of biodiesel and its fuel properties which are effective in the NO_x formation.

Online publication date: Wed, 06-May-2009

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