Abstract
The oxidation of propanal has been studied below the ignition region. The nature and relative concentration of products depend on both the temperature and the fuel-oxygen ratio due to the alternative reactions for the propionyl radical: C 2H 5 C ̇ +O 2⇌C 2H 5CO 3· (2) C 2H 5 C ̇ O(+M)→C 2H 5· + CO(+M) . (4) The products are described in terms of the subsequent reactions of peroxypropionyl and ethyl radicals, which, in competition, lead to the formation of peroxypropionic acid and ethyl hydroperoxide. By using propanal-2,2-d 2, the mechanism of several reactions are elucidated; in particular, the formation of acetaldehyde.
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