Fundamental Study for an efficient formation of radicals in the electrical discharge plasma

在本研究中，我们开发了在指定位置生成和还原关键自由基的控制方法，以构建新的自由基反应工程。首先，研究了N自由基在圆柱形表面放电等离子体中的行为。在这些实验结果的基础上，对化学反应工程进行了分析。发现在5 ms的停留时间内，N自由基的形成速率与失活速率基本平衡。N自由基失活是降低N自由基形成效率的主要因素。从这些结果可以看出，减少固体表面N自由基的失活是提高自由基形成效率的最重要因素。最后，我们检测了层流中圆柱壁上N自由基的失活率。从而明确了温度、压力和材料对N自由基失活速率的影响。

In this study, we developed the control method of generating and reducing key radicals at the specified place for the purpose of constructing a new radical reaction engineering. At first, it was examined the behavior of N radicals in the cylindrical surface discharge plasma. On the basis of these experimental results, we made the analysis of the chemical reaction engineering. It was found that the formation rate was balanced with the deactivation rate of N radicals within the residence time of 5 ms. It was also shown that the deactivation of N radicals was the main factor of decreasing formation efficiency of N radicals. From these results, it was realized that the abatement of the deactivation of N radicals on the solid surface was most important for an improvement of radical formation efficiency. Finally, we examined the deactivation rate of N radicals on the cylindrical wall in the laminar flow. As the result, we could make clear the effect of temperature, pressure and material on the deactivation rate of N radicals.