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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Shock Tube Measurement of the High-Temperature Rate Constant for OH + CH3 - Products
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Shock Tube Measurement of the High-Temperature Rate Constant for OH + CH3 - Products

机译：OH + CH3高温速率常数的冲击管测量->产品

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摘要

The reaction between hydroxyl (OH) and methyl radicals (CH,) is critical to hydrocarbon oxidation. Motivated by the sparseness of its high-temperature rate constant data and the large uncertainties in the existing literature values, the current study has remeasured the overall rate constant of the OH + CH3 reaction and extended the measurement temperature range to 1214-1933 K, using simultaneous laser absorption diagnostics for OH and CH3 radicals behind incident and reflected shock waves. ten-Butyl hydroperoxide and azomethane were used as pyrolytic sources for the OH and CH3 radicals, respectively. The current study bridged the temperature ranges of existing experimental data, and good agreement is seen between the current measurement and some previous experimental and theoretical high-temperature studies. A recommendation for the rate constant expression of the title reaction, based on the weighted average of the high-temperature data from selected studies, is given by k(1) = 4.19 X 10(1)(T/K)(3.15) exp(5270 K/T) cm(3) mol(-1) s(-1) +/- 30%, which is valid over 1000-2500 K
机译：羟基（OH）与甲基（CH1）之间的反应对于烃氧化至关重要。由于其高温速率常数数据的稀疏性和现有文献值的不确定性，当前研究重新测量了OH + CH3反应的总体速率常数，并将测量温度范围扩展至1214-1933 K，同时对入射和反射冲击波后面的OH和CH3自由基进行激光吸收诊断。十丁基氢过氧化物和偶氮甲烷分别用作OH和CH3自由基的热解源。当前的研究弥合了现有实验数据的温度范围，并且在当前的测量结果与一些先前的实验和理论高温研究之间可以看到很好的一致性。基于所选研究的高温数据的加权平均值，建议标题反应的速率常数表示为k（1）= 4.19 X 10（1）（T / K）（3.15）exp （5270 K / T）cm（3）mol（-1）s（-1）+/- 30％，适用于1000-2500 K

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