On the Autoxidation of Limonene under Cool Flame Conditions: Formation of Oxygenated and Aromatic Products
Résumé
The oxidation of limonene-O2-N2 mixtures and 1-methylcyclohexene-O2-N2 mixtures was conducted in a jet-stirred reactor (JSR) in the cool flame regime, fuel-lean conditions, and atmospheric pressure. Samples of the reacting mixtures were collected and analyzed by (i) on-line Fourier transform infrared spectroscopy, (ii) gas chromatography-mass spectrometry (GC-MS), and (iii) high resolution mass spectrometry after direct injection or chromatographic separation using reversed-phase ultra-high-performance liquid chromatography and +/-heated electrospray ionization and +/-atmospheric pressure chemical ionization. H/D exchange using deuterated water and reaction with 2,4-dinitrophenylhydrazine were performed to probe the presence of OH, OOH, and C=O groups in the products, respectively. A broad range of oxidation products ranging from final products to highly oxygenated products with five and more O-atoms, was detected. Besides, a range of aromatic and polyunsaturated products were also detected. A range of tools were used to characterize and rationalize the data: Van Krevelen plots, computation of the degree of unsaturation in products.
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Domaine public
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