Characterization of dielectric barrier discharges with water in correlation to productions of OH and H2O2 in gas and liquid phases
Characterization of dielectric barrier discharges with water in correlation to productions of OH and H2O2 in gas and liquid phases
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DOI：
10.7567/1347-4065/aafe73
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发表时间：
2019-03
影响因子：
1.5
通讯作者：
K. Tachibana;Toshihiro Nakamura
中科院分区：
文献类型：
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作者：
K. Tachibana;Toshihiro Nakamura
利用几种介质阻挡放电，我们研究了H2 O2分子在气相和液相中的产生机制。水蒸气通过气体进料管线中的水起泡器或填充下电极井的水的蒸发来供应。OH自由基的密度测量的光发射和激光诱导荧光光谱方法和相关的H2 O2在气相中的生产。在通过鼓泡器供给水蒸气的气相合成中获得的H2 O2的能量产额为0.1g kWh-1量级，而在使用液体电极的合成中获得的H2 O2的能量产额大于1g kWh-1。我们还研究了运输的OH和H2 O2物种从气相到液相，使用额外的供应H2 O2通过外部起泡器和乙醇作为OH清除剂混合在起泡水或电极水。从这些结果中，我们得出结论，H2 O2的生产主要是在气相中进行，并且产率的差异归因于在通过重复放电分解之前从放电区域提取产物的效率，这取决于反应器方案。
Using several types of dielectric barrier discharges, we studied the production mechanisms of H2O2 molecules in gas and liquid phases. Water vapor was supplied by a water bubbler in a gas-feed line or vaporization of water filling a lower electrode well. Densities of OH radicals were measured by optical emission and laser-induced fluorescence spectroscopic methods and correlated with the H2O2 production in gas phase. The energy yield of H2O2 obtained in the gas-phase synthesis with the supply of water vapor through the bubbler was on the 0.1 g kWh−1 order, while that in the synthesis with liquid electrode was larger than 1 g kWh−1. We investigated also the transport of OH and H2O2 species from gas phase to liquid phase, using additional supply of H2O2 through the outside bubbler and ethanol as an OH scavenger admixed either in the bubbling water or electrode water. From those results, we conclude that the production of H2O2 mainly proceeds in gas phase and the difference in the yields is attributed to the efficiency of extracting the product out of the discharge region before being decomposed by the repetitive discharge, which depends on the reactor schemes.