A product study of the gas-phase reaction of Methacrolein with the OH radical in the presence of NOx

✍ Scribed by Ernesto C. Tuazon; Roger Atkinson

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 583 KB
• Volume: 22
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550220604

✦ Synopsis

Abstract

The gas‐phase reaction of methacrolein with the OH radical, in the presence of NO~x~, was investigated at 298 ± 2 K and atmospheric pressure of air. Hydroxyacetone, methylglyoxal, a peroxyacyl nitrate identified as CH~2~  C(CH~3~)C(O)OONO~2~ (peroxymethacryloyl nitrate), formaldehyde, CO, and CO~2~ were observed to be the major products. The product yield data for these compounds show that OH radical addition to the >C  C< bond accounts for ca. 50% of the overall reaction, with the remaining ca. 50% proceeding via H—atom abstraction from the CHO group. The data suggest that the alkoxy radical
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formed following the addition of OH to the terminal carbon atom, decomposes primarily to give the formyl radical plus hydroxyacetone. A lower limit ratio of 5: 1 has been estimated for OH radical addition to the terminal carbon atom of the double bond relative to addition on the inner carbon atom.