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Biodiesel Impacts on Compression Ignition Engine (CIE): Analysis of Air Pollution Issues Relating to Exhaust Emissions

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In cities across the globe, the personal automobile is the single greatest polluter, as emissions from millions of vehicles on the road add up to a planet-wide problem. Vegetable oils have become more attractive recently because of their environmental benefits and the fact that they are made from renewable resources. With recent increases in petroleum prices and uncertainties concerning petroleum availability, there is renewed interest in vegetable oil fuels for diesel engines. The biodiesel impacts on exhaust emissions varied depending on the type of biodiesel and on the type of conventional diesel. Blends of up to 20% biodiesel mixed with petroleum diesel fuels can be used in nearly all diesel equipment and are compatible with most storage and distribution equipment. Using biodiesel in a conventional diesel engine substantially reduces emissions of unburned hydrocarbons, carbon monoxide, sulfates, polycyclic aromatic hydrocarbons, nitrated polycyclic aromatic hydrocarbons, and particulate matter. These reductions increase as the amount of biodiesel blended into diesel fuel increases. In general, biodiesel increases NO x emissions when used as fuel in a diesel engine. The fact that NO x emissions increase with increasing biodiesel concentration could be a detriment in areas that are out of attainment for ozone.
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Keywords: air pollution; biodiesel; diesel engine; exhaust emissions

Document Type: Research Article

Affiliations: Department of Chemical Engineering, Selcuk University, Konya, Turkey

Publication date: April 1, 2005

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