[1668]
Sekimoto, K., S. Inomata, H. Tanimoto, A. Fushimi, Y. Fujitani, K. Sato, and H. Yamada,
"Characterization of nitromethane emission from automotive exhaust",
Atmospheric Environment, vol. 81, pp. 523–531, Dec, 2013.
Link:
http://dx.doi.org/10.1016/j.atmosenv.2013.09.031
<p>We carried out time-resolved experiments using a proton-transfer-reaction mass spectrometer and a chassis dynamometer to characterize nitromethane emission from automotive exhaust. We performed experiments under both cold-start and hot-start conditions, and determined the dependence of nitromethane emission on vehicle velocity and acceleration/deceleration as well as the effect of various types of exhaust-gas treatment system. We found that nitromethane emission was much lower from a gasoline car than from diesel trucks, probably due to the reduction function of the three-way catalyst of the gasoline car. Diesel trucks without a NOx reduction catalyst using hydrocarbons produced high emissions of nitromethane, with emission factors generally increasing with increasing acceleration at low vehicle velocities.</p>
[1667]
Inomata, S., H. Tanimoto, Y. Fujitani, K. Sekimoto, K. Sato, A. Fushimi, H. Yamada, S. Hori, Y. Kumazawa, A. Shimono, et al.,
"On-line measurements of gaseous nitro-organic compounds in diesel vehicle exhaust by proton-transfer-reaction mass spectrometry",
Atmospheric Environment, vol. 73, pp. 195–203, Jul, 2013.
Link:
http://dx.doi.org/10.1016/j.atmosenv.2013.03.035
<p>Nitro-organic compounds, some of which cause adverse health effects in humans, are emitted in diesel engine exhaust. Speciation and quantification of these nitro-organic compounds in diesel engine exhaust particles have been extensively conducted; however, investigations into the emissions of gaseous nitro-organic compounds in diesel engine exhaust have not. In the present study, the properties of gaseous nitro-organic compounds in diesel engine exhaust were investigated through time-resolved measurement with a proton-transfer-reaction mass spectrometer and a chassis dynamometer. Three diesel trucks were tested, each with a different type of exhaust-gas treatment system (i.e., aftertreatment). Among the nitro-organic compounds detected, the emission of nitromethane was commonly observed and found to be related to the emissions of carbon monoxide, benzene, and acetone. The emission of other nitro-organic compounds, such as nitrophenol, depended on the vehicle, possibly due to the type of aftertreatment installed.</p>