Journal
ATMOSPHERIC ENVIRONMENT
Volume 81, Issue -, Pages 523-531Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2013.09.031
Keywords
Nitromethane; Oxidation catalyst; Proton-transfer-reaction mass spectrometry; Reduction catalyst; Three-way catalyst
Funding
- Ministry of the Environment through the Environment Research and Technology Development Fund [S2-05, S2-06, S-7]
- Grants-in-Aid for Scientific Research [24619005] Funding Source: KAKEN
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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 NO reduction catalyst using hydrocarbons produced high emissions of nitromethane, with emission factors generally increasing with increasing acceleration at low vehicle velocities. (C) 2013 Elsevier Ltd. All rights reserved.
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