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Research of Key Radicals for Plasma Chemical Reaction in Atmospheric Pressure Discharges

常压放电等离子体化学反应关键自由基的研究

基本信息

批准号：
17360127
负责人：
KANAZAWA Seiji
金额：
$ 9.56万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360127/
关键词：
Discharge Plasma Laser-Induced Fluorescence Environmental Protection OH Radical Streamer

项目摘要

Streamer coronas at atmospheric pressure are widely used in the non-thermal plasma processing of harmful gases. It is well known that hydroxyl (OH) radicals play an important role for the plasma chemical reactions in the reactor. Therefore, the direct study of the radicals in non-thermal plasma reactors is of great interest. Laser-induced fluorescence (LIF) is a useful diagnostic method for in-situ observation of the phenomena during the non-thermal plasma processing of gaseous pollutants.The OH radicals generated by the discharges have time transient characteristics (i.e. there are generation period and decay period during/after the discharge), and the lifetime is very short. While the DC streamer corona discharge consists of more of less regular self-repetitive current pulses (streamers) with the pulse duration up to several hundred nanoseconds and repetition frequency in the range of 1 to 100 kHz. In this study, taking into account on these time dependent characteristics, the time-r … More esolved and time-averaged behaviors of OH radicals were investigated.The LIF detection of the OH radicals was performed in the nozzle-to-plane electrode configuration (the radical injection and radical shower systems) during the steady-state positive streamer corona discharge at atmospheric pressure. For monitoring the ground-state OH radicals, the scheme with excitation at 282 nm and detection at 309 nm was used. The time relationship between the regular streamer coronas, laser pulse, OH fluorescence and laser-induced streamer was measured. The time dependence of OH radicals between the successive streamers was measured for the evaluation of OH dynamics. The two-dimensional OH distribution around the streamer corona region was also observed. As a result, it was found that the LIF could apply to the measurement of OH radicals generated by a DC streamer corona discharge at atmospheric pressure. The ground-state OH radicals were generated and stayed mainly in the region where streamers propagated between the electrodes. Less

大气压流光电晕广泛应用于有害气体的低温等离子体处理。众所周知，羟基自由基在反应器中的等离子体化学反应中起着重要的作用。因此，对低温等离子体反应器中自由基的直接研究具有重要意义。激光诱导荧光（LIF）是一种用于现场观察气体污染物低温等离子体处理过程的有效诊断方法，放电产生的OH自由基具有时间瞬态特性（即放电过程中和放电后都有产生期和衰减期），寿命很短。而直流流光电晕放电由更多的不太规则的自重复电流脉冲（流光）组成，脉冲持续时间高达几百纳秒，重复频率在1至100 kHz的范围内。在这项研究中，考虑到这些时间依赖性特征，时间-r ...更多信息研究了OH自由基的时均行为，采用自由基注入和自由基簇射两种电极结构，在大气压稳态正流光电晕放电条件下，对OH自由基进行了LIF检测。为了监测基态OH自由基，使用在282 nm处激发并在309 nm处检测的方案。测量了规则流光电晕、激光脉冲、OH荧光和激光诱导流光的时间关系。OH自由基之间的连续流光的时间依赖性进行测量的OH动力学的评价。还观察到了流注电晕区周围的二维OH分布。结果表明，激光诱导荧光可用于大气压直流流光电晕放电产生的OH自由基的测量。基态OH自由基的产生和主要停留在流光在电极之间传播的区域。少