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Kinetics of the CCO + NO and CCO + NO_2 Reactions

机译:CCO + NO和CCO + NO_2反应的动力学

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The kinetics of the reaction of CCO radicals with NO and NO_2 were studied using time-resolved infrared diode laser absorption spectroscopy. The rate constants were determined to be k_(CCO+NO) = (5.36 ± 0.5) * 10~(-11) and k_(CCO+NO_2) = (6.89 ± 0.5) * 10~(-11) cm~3 molecule~(-1) s~(-1) at 298 K. These rate constants have virtually no temperature dependence over the range 298-573 K, with Arrhenius fits given by k_(CCO+NO) = (1.66 ± 0.5) * 10~(-10) exp[(-337 ± 100)/T] and k_(CCO+NO_2) = (8.51 ± 1.5) * 10~(-11) exp[(-63 ± 80)/T] (error bars represent one standard deviation). Product channel measurements were performed on the CCO + NO reaction. After consideration of secondary chemistry, we obtain the branching ratios φ(CN + CO_2) = 0.13 ± 0.05 and φ(CO + NCO) = 0.87 ± 0.05 at 298 K. Ab initio quantum chemical calculations at the QCISD(T)/6-311G(2df,2pd) level of theory were used to examine probable reaction pathways.
机译:利用时间分辨红外二极管激光吸收光谱研究了CCO自由基与NO和NO_2反应的动力学。确定速率常数为k_(CCO + NO)=(5.36±0.5)* 10〜(-11)和k_(CCO + NO_2)=(6.89±0.5)* 10〜(-11)cm〜3分子在298 K时约为(-1)s〜(-1)。这些速率常数在298-573 K范围内几乎没有温度依赖性,Arrhenius拟合为k_(CCO + NO)=(1.66±0.5)* 10 〜(-10)exp [(-337±100)/ T]和k_(CCO + NO_2)=(8.51±1.5)* 10〜(-11)exp [(-63±80)/ T](误差线代表一个标准偏差)。产物通道的测量是在CCO + NO反应上进行的。在考虑了第二化学作用后,我们得到了在298 K时的支化比φ(CN + CO_2)= 0.13±0.05和φ(CO + NCO)= 0.87±0.05。在QCISD(T)/ 6-处从头算起量子化学计算理论水平的311G(2df,2pd)用于检查可能的反应途径。

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