Abstract
The laminar premixed n-propylamine (NPA) flame with equivalence ratio of 1.70 has been investigated at 4666.28 Pa using tunable synchrotron photoionization and molecular-beam mass spectrometry techniques. Chemical structures and mole fractions of 40 species were determined. Ethenol, allylamine, butadiyne, vinylacetylene, 1,3-butadiene, 1-butene, 2-butene, n-butyl radical, 1,3-cyclopentadiene, cyclopentene, 2-pentene, benzene, toluene, ethylbenzene, 2-propen-1-imine, cyclopropanimine, pyrrole, 2-butenenitrile and n-butylamine were newly identified in the amine flames. Mole fraction profiles of some species including reactants, intermediates and products in the NPA flame were given. HCN and N2 were observed as the primary N-containing products in the NPA flame, which was different from the result that NO was the major N-containing products in previous studies of nitrogen flames. The bond energies of NPA were calculated through quantum chemistry calculations on the basis of density functional theory at the CBS-QB3 level. It showed that the CH3CH2-CH2NH2 bond was the weakest and NPA mainly decomposed to CH2NH2 and C2H5 radicals. The H-abstractions at Cα by OH/O (NPA+OH=CH3CH2CHNH2+H2O and NPA+O=CH3CH2CHNH2+OH) had significant promoting effects on NPA consumption. The N conversion chain of NPA under flame conditions was proposed and detailed analysis with respect to intermediates especially the nitrogen-containing species were provided. The results will enrich the understanding of NPA flame and are essential to further establish the kinetic mechanism.
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Acknowledgment
The authors are grateful for the funding supports from National Natural Science Foundation of China (No. 52161145105), the Ministry of Science and Technology of China (No.2017YFA0402800), Beijing Municipal Natural Science Foundation (JQ20017), K.C. Wong Education Foundation and Recruitment Program of Global Youth Experts. The authors also thank the researchers in NSRL.
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Li, W., Chen, J., Yang, J. et al. Investigation of the Laminar Premixed n-Propylamine Flame. J. Therm. Sci. 31, 854–866 (2022). https://doi.org/10.1007/s11630-022-1528-6
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DOI: https://doi.org/10.1007/s11630-022-1528-6