首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Rate Constants for CH_3 + O_2 -> CH_3O + O at High Temperature and Evidence for H_2CO + O_2 -> HCO + HO_2
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Rate Constants for CH_3 + O_2 -> CH_3O + O at High Temperature and Evidence for H_2CO + O_2 -> HCO + HO_2

机译:CH_3 + O_2-> CH_3O + O的高温速率常数以及H_2CO + O_2-> HCO + HO_2的证据

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The reaction of CH_3 with O_2 has been studied in a reflected shock tube apparatus between 1600 and 2100 K. CH_3 was prepared from the fast thermal decomposition of CH_3I, and O atom atomic resonance absorption spectrometry (ARAS) was used to observe absolute [O]_t. [CH_3I]_0 was sufficiently low so that most secondary reactions were negligible, allowing for unambiguous determination of the rate constant for CH_3 + O_2 -> CH_3O + O. The rate constant expression for this reaction derived to match the experimental data is k= (3.90 +- 0.40) * 10~(-11) exp(-16858 +- 1127 K/T) cm~3 molecule~(-1) s~(-1). To explain O atom concentration buildup at longer times, a fast reaction between H_2CO and O_2 was postulated. Rate constants for this process were derived by fitting the long-time O atom profiles. Last, the four-center reaction CH_3 + O_2 -> CH_2O + OH was found to de of negligible importance over the temperature range of the study.
机译:CH_3与O_2的反应已在1600至2100 K之间的反射激波管装置中进行了研究。CH_3是由CH_3I的快速热分解制备的,并且使用O原子原子共振吸收光谱法(ARAS)观察了绝对[O]。 _t。 [CH_3I] _0足够低,因此大多数次级反应都可以忽略不计,从而可以明确确定CH_3 + O_2-> CH_3O + O的速率常数。该反应的速率常数表达式与实验数据匹配,得出k =( 3.90 +-0.40)* 10〜(-11)exp(-16858 + -1127 K / T)cm〜3分子〜(-1)s〜(-1)。为了解释O原子浓度在更长的时间内积累,推测H_2CO和O_2之间会发生快速反应。该过程的速率常数是通过拟合长时间的O原子分布图得出的。最后,发现在研究温度范围内,四中心反应CH_3 + O_2-> CH_2O + OH的重要性可忽略不计。

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