Kinetic Studies of Isoprene Reactions Initiated by Chlorine Atom
Kinetic Studies of Isoprene Reactions Initiated by Chlorine Atom
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氯原子引发的异戊二烯反应的动力学研究
DOI：
10.1021/jp000605h
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发表时间：
2000
影响因子：
2.9
通讯作者：
Renyi Zhang
中科院分区：
文献类型：
--
作者：
I. Suh;Renyi Zhang
使用与化学电离质谱（CIMS）检测相结合的快流反应器研究了由氯原子引发的异戊二烯的降解反应。动力学研究在 5 至 10 Torr 的压力范围和 298 ± 2 K 下进行。测得 Cl 和异戊二烯之间的反应速率常数为 (4.0 ± 0.3) × 10-10 cm3 molecular-1 s-1。使用 CIMS 方法，我们能够直接检测 Cl-异戊二烯反应的产物、HCl 和 Cl-异戊二烯加合物。确定 HCl 形成的支化率为 (17.4 ± 4.0)%。我们还测量了Cl-异戊二烯加合物与分子氧反应形成β-氯烯基过氧自由基的速率常数，其值为(1.0 ± 0.3) × 10-14 cm3 molecular-1 s-1。讨论了当前实验结果对大气的影响。
The degradation reactions of isoprene initiated by chlorine atom were investigated using a fast-flow reactor coupled to chemical ionization mass spectrometry (CIMS) detection. The kinetic studies were performed in the pressure range of 5 to 10 Torr and at 298 ± 2 K. The rate constant for the reaction between Cl and isoprene was measured to be (4.0 ± 0.3) × 10-10 cm3 molecule-1 s-1. Using the CIMS method, we were able to directly detect the products of the Cl−isoprene reaction, HCl and Cl−isoprene adduct. A branching ratio of (17.4 ± 4.0)% was determined for the HCl formation. We have also measured the rate constant for the reaction of the Cl−isoprene adduct with molecular oxygen to form the β-chloroalkenylperoxy radicals, with a value of (1.0 ± 0.3) × 10-14 cm3 molecule-1 s-1. Atmospheric implications of the present experimental results are discussed.