Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6341418 | Atmospheric Environment | 2013 | 8 Pages |
Abstract
Yields of methacrolein (MAC) and methyl vinyl ketone (MVK) from the OH-initiated oxidation of isoprene were measured under NOx-free conditions at 303, 323 and 343Â K and 1Â atm in a quartz reaction chamber coupled to a mass spectrometer. Measured yields of MAC and MVK were approximately 9-11% and 17â22%, respectively at temperatures between 303 and 343Â K, in good agreement with previous studies. The measured yields of MAC and MVK, at 303 and 323Â K as well as the measured yield of MAC at 343Â K were reproduced reasonably well using an explicit model of isoprene oxidation. However, the experimental yields of MVK at 343Â K were underestimated by the model, suggesting that a temperature dependent source of MVK was missing. Several recently proposed additions to the isoprene oxidation mechanism, including 1,6- and 1,5-H shift isomerization reactions of isoprene-based hydroxyalkyl peroxy radicals, were tested in order to determine if these mechanisms can explain the observed temperature dependence of the product yields.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
Maria A. Navarro, Sebastien Dusanter, Philip S. Stevens,