Abstract
The gas-phase reaction of O(3
P) atoms with benzene was investigated in a flow system in the pressure range of 50–100mbar and a temperature of 295 ± 2K with a focus on the product formation. O2 concentrations in the carrier gas were in the range of (7.7–84) × 1014 molecule cm−3. The primary stable products detected were phenol, benzene oxide/oxepin and a not identified compound with the probable composition C5H6O. The yields of phenol and benzene oxide/oxepin were 0.12 ± 0.02 and 0.26 ± 0.06, respectively, being not affected by the experimental conditions. For benzene oxide/oxepin, a rapid consecutive reaction with O(3
P) atoms was observed with a rate coefficient of k
(295K) = (1.1 ± 0.1) × 10−10cm3 molecule−1s−1 measured at a pressure of 100mbar. A substance with the formula C6H6O2 (likely oxepin 4,5-epoxide or oxepin 2,3-epoxide), the isomers of muconaldehyde, as well as formic acid, acrolein and trans-butenedial were identified as products of the reaction of O(3
P) atoms with benzene oxide/oxepin.
摘要
在压力范围为50-100mbar,温度为295±2K的流动系统中,研究了O(3P)原子与苯的气相反应,重点关注产物的形成。载气中的O2浓度在(7.7-84)×1014分子cm−3的范围内。检测到的主要稳定产物是苯酚、苯氧化物/氧杂环己烷和一个未确定化合物,其可能的组成为C5H6O。苯酚和苯氧化物/氧杂环己烷的产率分别为0.12±0.02和0.26±0.06,不受实验条件的影响。对于苯氧化物/氧杂环己烷,观察到与O(3P)原子的快速连续反应,其在100mbar压力下的速率系数为k(295K) = (1.1±0.1)×10−10cm3分子−1s−1。检测到的反应产物包括C6H6O2(可能是氧杂环己烷4,5-环氧或氧杂环己烷2,3-环氧)、muconaldehyde的异构体、甲酸、丙烯醛和trans-丁烯二醛。