Experimental product study of the OH-initiated oxidation of m-xylene
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abstract
We performed laboratory studies to investigate the OH-initiated oxidation of m-xylene using a fast flow reactor coupled to ion drift-chemical ionization mass spectrometry (ID-CIMS). Seven products consisting of ring-retaining and ring-opening components have been identified and quantified. Three products, methylglyoxal, 4-oxo-2-pentenal and 2-methyl-4-oxo-2-butenal, and dimethylphenols exhibited a dependence of the formation yields on the O2 and NO concentration. We reported for the first time the yields (%) of three other products, 2-methyl-4-oxo-2-penetal (4.89 0.52), diunsaturated dicarbonyls (2-methyl-6-oxo-2,4-heptadienal and 4-methyl-6-oxo-2,4-heptadienal, 7.82 1.0), and epoxy carbonyls (2,4-dimethyl-2,3-epoxy-6-oxo-4-hexenal, 2,6-dimethyl-2,3-epoxy-6-oxo-4-hexenal, and 3,5-dimethyl-2-hydroxyl-3,4-epoxy-5-hexenal, 2.18 0.20). m-Tolualdehyde, with a yield of 6.42 0.89, is consistent with previous studies. The yield of methylglyoxal (15.1 4.2) is consistent with its co-products, but lower than the literature values. The dependence of product distributions on O2 and NO concentration was discussed. The mechanism leading to the formation of the products was proposed. 2005 Elsevier B.V. All rights reserved.
