Product distributions from the OH radical-induced oxidation of but-1-ene, methyl-substituted but-1-enes and isoprene in NOx-free air
作者:Heinz-Jürgen Benkelberg、Olaf Böge、Ralph Seuwen、Peter Warneck
DOI:10.1039/b002053m
日期:——
Product distributions resulting from the OH-induced oxidation of but-1-ene, 2-methylbut-1-ene, 3-methylbut-1-ene and isoprene in air were measured in the absence of nitrogen oxides and compared with predictions based on currently accepted oxidation mechanisms. In the case of butenes, the observed distributions of carbonyl compounds, hydroxyketones, hydroxyalkanals and diols were evaluated to obtain
在没有氮氧化物的情况下测量了空气中 OH 诱导的 1-1-烯、2-甲基丁-1-烯、3-甲基丁-1-烯和异戊二烯的氧化产物分布,并与基于目前的预测进行了比较公认的氧化机制。在丁烯的情况下,对观察到的羰基化合物、羟基酮、羟基链烷醛和二醇的分布进行了评估,以获得 OH 自由基初始攻击双键外部位置的概率(对于 2-Me-but,γ = 0.90 ± 0.03 -1-ene 和 γ = 0.76 ± 0.05(对于 but-1-ene 和 3-Me-but-1-ene),用于在二级 β-羟基过氧自由基的自反应中形成稳定产物的概率(kssb /kss = 0.29 ± 0.07 对于丁-1-烯和 kssb/kss = 0.19 ± 0.06 对于 3-Me-but-1-ene),以及与氧气反应的比率 s。β-羟基烷氧基自由基的分解,k3[O2]/(k4 + k3[O2]) = 0.25 ± 0.04