The influence of carrier gas on plasma properties and hydrogen peroxide production in a nanosecond pulsed plasma discharge generated in a water-film plasma reactor
The influence of carrier gas on plasma properties and hydrogen peroxide production in a nanosecond pulsed plasma discharge generated in a water-film plasma reactor
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DOI：
10.1088/1361-6463/aaa835
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
Huihui Wang;R. Wandell;B. Locke
中科院分区：
文献类型：
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作者：
Huihui Wang;R. Wandell;B. Locke
研究了载气（氩气和氦气）对水膜等离子体反应器中沿水面传播的纳秒脉冲丝状放电特性的影响，以及等离子体特性对过氧化氢（H2O2）形成的影响。测量并比较了氩气和氦气放电的等离子体性能，包括电子密度、气体温度、等离子体体积、过氧化氢生成速率和能量产率。结果表明，氦等离子体比氩等离子体具有更强的扩散能力，其电子密度和气体温度较低，但体积较大。虽然氦等离子体中的电子密度要低得多，但过氧化氢的生成速率和能量产量仅略高。一个简单的数学模型，考虑了等离子体核心周围的小薄膜中随时间变化的快速自由基和电子猝灭，以及H2O2形成和降解的集中反应动力学，表明氩气放电时羟基自由基（·OH）浓度大约是氩气放电时的两倍，但氦气体积越大，氦气中总·OH的浓度大约是氩气放电时的两倍，相应的能量产率也越高。实验数据和模型表明，在较低的功率（或比能量密度）下，两种载气的H2O2产能都可能增加。
The influence of carrier gas (argon and helium) on the properties of a nanosecond pulsed filamentary discharge propagating along the water surface in a water film plasma reactor, and the effects of plasma properties on the formation of hydrogen peroxide (H2O2) are investigated. The plasma properties, including electron density, gas temperature, and plasma volume, and the hydrogen peroxide production rate and energy yield were measured and compared in both argon and helium discharges. The results show that helium plasma is more diffusive compared with the argon plasma, and it has lower electron density and gas temperature but larger volume. The production rates and energy yields of hydrogen peroxide are only slightly higher in the helium plasma although the electron density is much lower. A simple mathematical model with time-dependent fast radical and electron quenching in a small film surrounding the plasma core and with lumped reaction kinetics for H2O2 formation and degradation suggests that the hydroxyl radical (·OH) concentration is approximately two times higher in the argon discharge, but the larger volume of the helium leads to about two times more total ·OH in the helium with correspondingly higher energy yields. The experimental data and model imply that the H2O2 energy yield may increase at lower power (or specific energy density) for both carrier gases.