Rate coefficients for reactions of OH and Cl with esters.
Rate coefficients for reactions of OH and Cl with esters.
复制标题
OH 和 Cl 与酯反应的速率系数。
作者：
Peng Liang;Y. Mu;V. Daële;A. Mellouki
用绝对法和相对法测定了OH自由基与丁酸正丙酯（k(1)）、丙酸正丁酯（k(2)）和丁酸正丁酯（k(3)）气相反应的速率系数。在273-372 K温度范围内获得的动力学数据用于推导Arrhenius表达式(以cm（3)分子（-1）s（-1）为单位）：K(1)=（1.92±0.50）×10(-12) exp[(400±80)/T]， K(2)=（2.98±1.32）×10(-12) exp[(209±139)/T]和K(3)=（5.35±3.34）×10(-12) exp[(180±194)/T]。此外，用相对速率法测定了三种酯类在常温常压下与Cl原子反应的速率系数。测量的速率系数(以10(-10)cm（3)分子（-1）s（-1）为单位）如下：丁酸正丙基（1.4±0.1），丙酸正丁基（1.6±0.1）和丁酸正丁基（1.7±0.1）。给出了所得值，并与以前的测定结果进行了比较和讨论。还介绍了这项工作产生的反应性趋势和大气影响。
Rate coefficients for the gas-phase reactions of OH radicals with n-propyl butyrate (k(1)), n-butyl propionate (k(2)) and n-butyl butyrate (k(3)) are measured by both absolute and relative methods. The kinetics data obtained over the temperature range 273-372 K are used to derive the Arrhenius expressions (in units of cm(3) molecule(-1) s(-1)): k(1)=(1.92±0.50)×10(-12) exp[(400±80)/T], k(2)=(2.98±1.32)×10(-12) exp[(209±139)/T] and k(3)=(5.35±3.34)×10(-12) exp[(180±194)/T]. In addition, the rate coefficients for reactions of the three esters with Cl atoms are determined by the relative-rate method at room temperature and atmospheric pressure. The rate coefficients measured are (in units of 10(-10) cm(3) molecule(-1) s(-1)) as follows: n-propyl butyrate (1.4±0.1), n-butyl propionate (1.6±0.1), and n-butyl butyrate (1.7±0.1). The values obtained are presented, compared with previous determinations and discussed. Reactivity trends and atmospheric implications resulting from this work are also presented.