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首页> 外文期刊>Environmental Science & Technology >Kinetics and products of photolysis and reaction with OH radicals of a series of aromatic carbonyl compounds
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Kinetics and products of photolysis and reaction with OH radicals of a series of aromatic carbonyl compounds

机译：一系列芳族羰基化合物的光解动力学以及与OH自由基反应的产物

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We have investigated the photolysis and OH radical reactions of phthaldialdehyde, 2-acetylbenzaldehyde, and 1,2-diacetylbenzene, atmospheric reaction products of naphthalene and alkylnaphthalenes, and of phthalide, a photolysis product of phthaldialdehyde. Using a relative rate method with 1,2,4-trimethylbenzene and 2,2,3,3-tetramethylbutane as reference compounds, measured rate constants for the gas-phase OH radical reactions (in units of 10(-12) cm(3) molecule(-1) s(-1)) were as follows: phthaldialdehyde, 23 +/- 3; 2-acetylbenzaldehyde, 17 +/- 3; 1,2-diacetylbenzene, < 1.2; and phthalide,< 0.8. Blacklamp irradiation showed that phthaldialdehyde and 2-acetylbenzaldehyde photolyze, and, combined with absorption spectra measured in n-hexane solution, average photolysis quantum yields of 0.19 and 0.21, respectively, were derived (290-400 nm). No evidence for photolysis of 1,2-diacetylbenzene or phthalide by blacklamps was obtained. The major atmospheric loss process of phthaldialdehyde and 2-acetylbenzaldehyde are estimated to be by photolysis, with photolysis lifetimes of 1.4-1.5 h for a 12-hr average NO2 photolysis rate of 0.312 min(-1). Phthalic anhydride was the major observed product from the OH radical-initiated reactions of all four compounds and was also formed from photolysis of phthaldialdehyde and 2-acetylbenzaldehyde. The major photolysis products observed were phthalide from phthaldialdehyde and 3-methylphthalide from 2-acetylbenzaldehyde.
机译：我们已经研究了苯二醛，2-乙酰基苯甲醛和1,2-二乙酰基苯（萘和烷基萘的常压反应产物）和苯酞（苯二醛的光解产物）的光解和OH自由基反应。使用相对速率法，以1,2,4-三甲基苯和2,2,3,3-四甲基丁烷为参比化合物，测量气相OH自由基反应的速率常数（以10（-12）cm（3为单位） ）分子（-1）s（-1））如下：苯二醛，23 +/- 3; 2-乙酰基苯甲醛，17 +/- 3; 1,2-二乙酰苯，<1.2;和邻苯二甲酸酯，＜0.8。黑灯照射表明，苯二醛和2-乙酰基苯甲醛发生光解，并结合在正己烷溶液中测得的吸收光谱，得出平均光解量子产率分别为0.19和0.21（290-400 nm）。没有证据表明黑灯可以光解1,2-二乙酰苯或邻苯二甲酰亚胺。苯二醛和2-乙酰基苯甲醛的主要大气损失过程估计是通过光解，光解寿命为1.4-1.5小时，平均12小时NO2光解速率为0.312 min（-1）。邻苯二甲酸酐是从所有四种化合物的OH自由基引发的反应中观察到的主要产物，也是由苯二醛和2-乙酰基苯甲醛的光解形成的。观察到的主要光解产物是邻苯二甲醛制的苯酞和2-乙酰基苯甲醛制的3-甲基邻苯二酚。

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