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首页> 外文期刊>Environmental Science & Technology >Kinetics and Products of the Gas-Phase Reactions of 6-Methyl-5-hepfen-2-one and trans-Cinnamaldehyde with OH and NO_3 Radicals and O_3 at 296 ±2 K
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Kinetics and Products of the Gas-Phase Reactions of 6-Methyl-5-hepfen-2-one and trans-Cinnamaldehyde with OH and NO_3 Radicals and O_3 at 296 ±2 K

机译：296±2 K下6-甲基-5-庚基-2-酮与反肉桂醛与OH和NO_3自由基和O_3气相反应的动力学和产物

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摘要

6-Methyl-5-hepten-2-one is an atmospheric reaction product of the biogenic emission linalool, and trans-cinnamaldehyde is a model compound for dicarbonyls formed from the OH radical-initiated reaction of naphthalene. These carbonyl compounds react in the atmosphere, and photolysis and the gas-phase reactions of 6-methyl-5-hepten-2-one and trans-cinnamaldehyde with OH radicals, IMO_3 radicals, and O_3 have been investigated at 296 ± 2 K and atmospheric pressure of air. Using relative rate methods, the respective rate constants obtained for the OH radical, NO_3 radical, and O_3 reactions were (in cm~3 molecule~(-1) s~(-1) units) as follows: for 6-methyl-5-hepten-2-one: (1.57 ± 0.39) x 10~(-10),(7.5±3.0) x 10~(-12), and (3.9 ± 1.5) x 10~(-16); for trans-cinnamaldehyde: (4.8 ± 1.4) x 10~(-11), (1.9 ± 0.7) x 10~(-14), and (2.2 ± 1.8) x 10~(-18). trans-Cinnamaldehyde was also observed to photolyze. Benzaldehyde was observed and quantified from the OH radical reaction with trans-cinnamaldehyde, with a yield of 0.90 ± 0.39. Acetone and CH_3C(O)CH_2CH_2CHO were observed and quantified from the OH radical and O_3 reactions with 6-methyl-5-hepten-2-one, with formation yields of 0.706 ± 0.054 and 0.59 ± 0.13, respectively, from the OH radical reaction and 0.302 ± 0.048 and 0.82 ± 0.21, respectively, from the O_3 reaction. The reaction mechanisms are discussed.
机译：6-甲基-5-庚烯-2-酮是生物排放芳樟醇的大气反应产物，反式肉桂醛是由萘的OH自由基引发的反应所形成的二羰基化合物的模型化合物。这些羰基化合物在大气中发生反应，并研究了在296±2 K和大气压力。使用相对速率法，分别针对OH自由基，NO_3自由基和O_3反应获得的速率常数为（以cm〜3分子〜（-1）s〜（-1）单位）：对于6-甲基-5 -庚-2-酮：（1.57±0.39）x 10〜（-10），（7.5±3.0）x 10〜（-12）和（3.9±1.5）x 10〜（-16）;反式肉桂醛：（4.8±1.4）x 10〜（-11），（1.9±0.7）x 10〜（-14）和（2.2±1.8）x 10〜（-18）。还观察到反肉桂醛发生光分解。观察到苯甲醛并通过与反式肉桂醛的OH自由基反应进行定量，产率为0.90±0.39。观察到丙酮和CH_3C（O）CH_2CH_2CHO并从OH自由基和与6-甲基-5-庚烯-2-一的O_3反应中定量得到，OH自由基反应的形成产率分别为0.706±0.054和0.59±0.13 O_3反应分别为0.302±0.048和0.82±0.21。讨论了反应机理。

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