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Development of a Microwave-induced Plasma Reactor Combined with Catalyst for Harmful Gas Treatment

微波诱导等离子体反应器与催化剂结合用于有害气体处理的研制

基本信息

批准号：
11650290
负责人：
KANAZAWA Seiji
金额：
$ 2.3万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650290/
关键词：
Microwave discharge Atmospheric pressure plasma Plasma catalytic reaction Photocatalyst VOC

项目摘要

Non-thermal plasma processing has been considered as one of the most effective methods for harmful gas treatment. However, the issues to be solved are the improvement of the energy efficiency and the control of undesirable by-products. To improve the energy efficiency, utilization of catalyst/adsorbent into plasmas was investigated. Microwave discharges are attractive for this purpose due to their property to have different plasma compared to the conventional non-thermal plasmas and due to their ability to heat a material such as a catalyst. In this study, a microwave induced plasma reactor was developed and used for decomposition of harmful gas. The reactor consists of a quartz glass tube which inserts in the waveguide vertically. To sustain the plasma at atmospheric pressure, a fine carbon rod covered by an alumina tube is set inside the quartz glass tube coaxially to act as a source of electrons. Especially, the combination of plasma with photocatalyst was studed. NO and toluene (C_6H_5CH_3) were chosen as test gases. As a results, the microwave plasma could be generated stably at atmospheric pressure with low microwave power (<10W). It was found that efficient decomposition of NO and toluene was possible using the microwave plasma process. The combination of the plasma and photocatalyst (TiO_2) was effective for improving efficiency at lower power consumption. The NO and toluene decomposition rates increase with increasing the specific energy density, while the energy efficiency decreases with increasing the specific energy density. However, decomposition efficiency nonmonotonically depends on the gas flow rate. The energy efficiency obtained was the same order with conventional non-thermal plasma processes such as dc corona and dielectric barrier discharges induced plasma processes.

非热等离子体处理被认为是有害气体处理最有效的方法之一。然而，需要解决的问题是提高能源效率和控制不良副产品。为了提高能源效率，对等离子体中催化剂/吸附剂的利用进行了研究。微波放电对于此目的很有吸引力，因为与传统的非热等离子体相比，微波放电具有不同的等离子体特性，并且能够加热催化剂等材料。在这项研究中，开发了微波诱导等离子体反应器并用于有害气体的分解。反应器由垂直插入波导的石英玻璃管组成。为了将等离子体维持在大气压下，一根由氧化铝管覆盖的细碳棒同轴地设置在石英玻璃管内，以充当电子源。特别是，研究了等离子体与光催化剂的结合。选择NO和甲苯(C_6H_5CH_3)作为测试气体。结果，可以在大气压下以低微波功率（<10W）稳定地产生微波等离子体。研究发现，使用微波等离子体工艺可以有效分解 NO 和甲苯。等离子体和光催化剂（TiO_2）的结合可以有效地以较低的功耗提高效率。 NO和甲苯的分解率随着比能量密度的增加而增加，而能量效率随着比能量密度的增加而降低。然而，分解效率非单调地取决于气体流速。所获得的能量效率与传统的非热等离子体工艺（例如直流电晕和介电阻挡放电诱导等离子体工艺）处于同一数量级。