title: Effects of low concentration biodiesel blends application on modern passenger cars. Part 3: impact on PAH, nitro-PAH, and oxy-PAH emissions.
abstract: This study explores the impact of five different types of methyl esters on polycyclic aromatic hydrocarbon (PAH), nitrated-PAH and oxygenated PAH emissions. The measurements were conducted on a chassis dynamometer, according to the European regulation. Each of the five different biodiesels was blended with EN590 diesel at a proportion of 10-90% v/v (10% biodiesel concentration). The vehicle was a Euro 3 compliant common-rail diesel passenger car. Emission measurements were performed over the NEDC and compared with those of the real traffic-based Artemis driving cycles. The experimental results showed that the addition of biodiesel led to some important increases in low molecular-weight PAHs (phenanthrene and anthracene) and to both increases and reductions in large PAHs which are characterised by their carcinogenic and mutagenic properties. Nitro-PAHs were found to reduce with biodiesel whereas oxy-PAH emissions presented important increases with the biodiesel blends. The impact of biodiesel source material was particularly clear on the formation of PAH compounds. It was found that most PAH emissions decreased as the average load and speed of the driving cycle increased. Cold-start conditions negatively influenced the formation of most PAH compounds. A similar trend was observed with particulate alkane emissions.
authors.affiliation: Laboratory of Fuels Technology and Lubricants, National Technical University of Athens, 9 Iroon Polytechniou Str., Zografou Campus, 15780 Athens, Greece.
authors.forename: Georgios
authors.initials: G
authors.lastname: Karavalakis
authors.forename: Georgios
authors.initials: G
authors.lastname: Fontaras
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Ampatzoglou
authors.forename: Marina
authors.initials: M
authors.lastname: Kousoulidou
authors.forename: Stamoulis
authors.initials: S
authors.lastname: Stournas
authors.forename: Zissis
authors.initials: Z
authors.lastname: Samaras
authors.forename: Evangelos
authors.initials: E
authors.lastname: Bakeas
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D001336:Automobiles; D056804:Biofuels / Q000032:analysis*; D004787:Environmental Pollution / Q000517:prevention & control*; D015394:Molecular Structure; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D056804:Biofuels; D011084:Polycyclic Aromatic Hydrocarbons