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Effect of Antioxidant Addition on NOx Emissions from Biodiesel

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Biodiesel is a renewable, domestically produced fuel that has been shown to reduce particulate,
hydrocarbon, and carbon monoxide emissions from diesel engines. Biodiesel produced from certain
feedstocks, however, has been shown to cause an increase in nitrogen oxides (NOx), which is of
particular concern in urban areas that are subject to strict environmental regulations. There
are several pathways proposed that try to account for NOx formation during the combustion
process, one of which is the Fenimore mechanism. In the Fenimore mechanism, it is postulated
that fuel radicals formed during the combustion process react with nitrogen from the air to form
NOx. We proposed that if these radical reactions could be terminated, NOx production from
biodiesel combustion would decrease. To test this hypothesis, we investigated the ability of
antioxidants, which are capable of terminating these kinds of radical reactions, to reduce NOx
levels in biodiesel exhaust. Several antioxidants added to a 20% soy biodiesel/80% diesel fuel
blend (B20) at a concentration of 1000 ppm were screened using a small, minimally instrumented
diesel engine to test their ability to reduce NOx emissions. The engine used for these studies was
a single cylinder, direct-injection, air-cooled, naturally aspirated Yanmar engine. The NO and
NO2 in the exhaust stream were quantified using electrochemical sensors, and differences in
NOx emissions from the combustion of B20 with and without antioxidant were compared. The
addition of butylated hydroxyanisole or butylated hydroxytoluene reduced NOx emissions, but
the other antioxidants tested did not have this effect.

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Informasi Detail

Judul Seri

Energy & Fuels

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2005

Deskripsi Fisik

Energy & Fuels 2005, 19, 1749-1754

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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