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Ozonolysis of a series of C7-C9 unsaturated biogenic aldehydes: reactivity study at atmospheric pressure

机译:一系列C7-C9不饱和生物醛的臭氧分解:在大气压下的反应性研究

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Rate coefficients for the reactions of O-3 with trans-2-heptenal, trans-2-octenal and trans-2-nonenal have been determined at 298 K and (990 +/- 10) mbar in an environmental chamber with in situ FTIR spectroscopy. The following rate coefficients in units of k(O3) x 10(18) (cm(3) molecule(-1) s(-1)) were obtained: (2.47 +/- 0.73) for trans-2-heptenal, (2.37 +/- 0.68) for trans-2-octenal and (2.05 +/- 0.20) for trans-2-nonenal. It is shown that rate coefficients for the addition of O-3 molecules and OH radicals to the double bond of alkenes and unsaturated and oxygenated volatile organic compounds (OVOCs) at 298 K are related to a good approximation by the expression: log k(OH) = 0.16 log k(O3) - 7.55. Furthermore, a correlation between the reactivity of unsaturated VOCs toward O-3 molecules and the energies of the Highest Occupied Molecular Orbit (HOMO) of the unsaturated VOCs is presented and potential atmospheric implications of the results are discussed.
机译:O-3与反-2-庚烯,反-2-辛烯和反-2-壬烯反应的速率系数已在298 K和(990 +/- 10)mbar的环境室内采用原位FTIR测定光谱学。获得以下速率系数,单位为k(O3)x 10(18)(cm(3)分子(-1)s(-1)):反式2-庚烯(2.47 +/- 0.73),(反式2-辛烯醛为2.37 +/- 0.68),反式-2-壬烯醛为(2.05 +/- 0.20)。结果表明,在298 K下,O-3分子和OH自由基加成至烯烃和不饱和和含氧的挥发性有机化合物(OVOCs)的双键的速率系数与以下公式的近似近似相关:log k(OH) )= 0.16 log k(O3)-7.55。此外,提出了不饱和VOC对O-3分子的反应性与不饱和VOC的最高占据分子轨道(HOMO)的能量之间的相关性,并讨论了结果的潜在大气意义。

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