甲烷光氧化反应速率常数及其在大气中的寿命

应用具有分析系统的、可抽真空的烟雾箱进行甲烷在空气中光化学反应的模拟研究。详细研究了CH₄空气及CH₄－O3－空气两个体系的光化学反应，描绘了反应物和产物的浓度随时间变化曲线，得到甲烷的光化学氧化具有准一级反应特性的结论，证明了O₃的加入可加速甲烷的衰减。定量地测定了甲烷衰减的表观速率常数，并根据实验数据推算了甲烷在大气中的寿命。

Study on reaction rate constants of CH_4 and its life-time

The simulative experiments of photochemical reaction of CH_4 were studied by using the evacuable photochemical smog chamber.Experiments of CH_4-air and CH_4-O_3-air systems were carried out at atmospheric pressure in the evacuable smog chamber.The results were shown as follows:photochemical oxidation reaction of CH_4 is first order reaction.The decay of CH_4 was accelerated by adding O_3 to the chamber.The apparent reaction rate constants of CH_4 decay for both reaction systems were measured in this study.The life-time of CH_4 in atmosphere was also estimated from experimental data.