Acetaldehyde is not only an observed emission species but also a key intermediate produced during the combustion or low-temperature oxidation of fossil fuels as well as biofuels. Investigations into the low-temperature oxidation mechanisms for acetaldehyde are essential to better understanding some interesting phenomena like auto-ignition or cool flames. Therefore, experiments in a Jet Stirred Reactor were conducted with a fixed residence time around 2.7 s at low-temperature range (528 to 946 K) at 700 Torr. To our knowledge, this is the first set of detailed experimental results of the low-temperature oxidation of acetaldehyde. The mole fractions of 30 species were measured as functions of temperature by employing a molecular beam mass spectrometer using synchrotron generated vacuum ultra-violet photons as ionization source. Theoretical calculations were conducted to help with the identification and quantification of the peroxided intermediates (CH_3O_2 and C_2H_4O_3 isomers), providing valuable information for the low-temperature oxidation of acetaldehyde. Based on the measured concentration profiles of various species, especially for the oxygenated intermediates, suggestions for further improvement on the mechanisms are proposed. This experimental study provides an opportunity to advance our knowledge of the low-temperature oxidation of acetaldehyde.
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