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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Rate Constants for Reaction of CH_2FCH_2F (HFC-152) and CH_3CHF_2 (HFC-152a) with Hydroxyl Radicals
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Rate Constants for Reaction of CH_2FCH_2F (HFC-152) and CH_3CHF_2 (HFC-152a) with Hydroxyl Radicals

机译：CH_2FCH_2F（HFC-152）和CH_3CHF_2（HFC-152a）与羟基自由基反应的速率常数

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摘要

The rates of reaction, Arrhenius preexponential factors, and activation energies of CH_2FCH_2F (HFC-152) and CH_3CHF_2 (HFC-152a) for the abstraction reaction with hydroxyl radical were measured by a relative rate method. Temperature ranges were 287-409 and 286-403 K, respectively. Reference compounds for both reactants were ethane (k = 1.00 * 10~(-11) e_(-1094/T) cm~3 molec.~(-1) s~(-1)) and cyclopropane (k 7.28 * 10~(-12) e~(-1356/T) cm~3 molec.~(-1) s~(-1)). Also, the JPL 97-4 recommendation for HFC-152a (k = 2.4 * 10~(-12) e~(-1260/T) cm~3 molec.~(-1)s~(-1)) was used as a reverence for HFC-152 vs 152a experiments. For HFC-152, the combined results yielded an Arrhenius expression of k = 3.55 * 10~(-12) e~(-1084/T) cm~3 molec~(-1) s~(-1). The result for HFC-152a was k = 1.86 * 10~(-12) e~(-1183/T) cm~3 molec~(-1) s~(-1). For both reactants, uncertainties in k(298K) and E/R are believed to be less than 10% and 100 K, respectively. The experimental results are compared with predicted values based on previously observed group effects as well as the dependence of preexponential factors on the magnitude of the rate constant. The results are also compared to previously published values for these same compounds obtained by absolute methods.
机译：通过相对速率法测量了与羟基自由基抽象反应的CH_2FCH_2F（HFC-152）和CH_3CHF_2（HFC-152a）的反应速率，Arrhenius指数因子和活化能。温度范围分别为287-409和286-403K。两种反应物的参考化合物为乙烷（k = 1.00 * 10〜（-11）e _（-1094 / T）cm〜3 mole。〜（-1）s〜（-1））和环丙烷（k 7.28 * 10〜 （-12）e〜（-1356 / T）cm〜3摩尔〜（-1）s〜（-1））。同样，使用了针对HFC-152a的JPL 97-4建议（k = 2.4 * 10〜（-12）e〜（-1260 / T）cm〜3摩尔。〜（-1）s〜（-1））。作为对HFC-152与152a实验的认可。对于HFC-152，合并结果产生了k = 3.55 * 10〜（-12）e〜（-1084 / T）cm〜3 molec〜（-1）s〜（-1）的Arrhenius表达式。 HFC-152a的结果为k = 1.86 * 10〜（-12）e〜（-1183 / T）cm〜3摩尔〜（-1）s〜（-1）。对于这两种反应物，k（298K）和E / R的不确定度分别被认为小于10％和100K。将实验结果与基于先前观察到的组效应以及预指数因子对速率常数幅度的依赖关系的预测值进行比较。还将结果与通过绝对方法获得的这些相同化合物的先前公布值进行比较。

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