Design of Decomposition System of Toxic Substances in Exhaust Gases by Microwave-induced Plasma under Atmospheric Pressure

大气压下微波诱导等离子体分解废气中有毒物质系统设计

• 批准号: 13555221
• 负责人: SHIMIZU Yasuhiro
• 金额: $ 8.96万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555221/
• 关键词: Microwave-induced Plasma; Porous SiC Ceramics; Nonthermal Plasma inLiquid Phase; Nonthermal Plasma in Gas Phase; Diesel Particulate Matters; NO_x; Treatment of Exhaust Gases; Purification of Environmental Pollutants; 大気圧プラズマ; 水中プラズマ; β-ナフトール; S

The following three subjects have been mainly studied in this project, and the results obtained are summarized below.1) Control of Microwave-induced Plasma in Liquid Phase and Decomposition of Organic CompoundsBehavior of microwave-induced plasmas generated from various ceramic triggers in pure water, dichloroacetic acid (DCAA) and β-naphthol aqueous solution and their abilities for decomposing these organic compounds have been investigated. The use of SiC ceramics or carbon block as a trigger in liquid phase resulted in formation of gaseous CO_2 due to partial decomposition of the trigger itself. In the case of decomposition of DCAA, La_<0.8>Sr_<0.2>CoO_3 was found to be the most suitable trigger from the viewpoints of conversion of DCAA, amounts of partial decomposition products and long-term stability as a trigger. In the case of decomposition of β-naphthol, however, FeSi was superior to other triggers, being accompanied with high ability for decomposing β-naphthol and excellent sta … More bility in liquid phase.2) Control of Microwave-induced N_2 Plasma under Atmospheric Pressure from Various Porous Ceramic Triggers and Improvement of Ability for Decomposing Dioxin-related CompoundsBehavior of microwave-induced plasmas generated from various porous ceramic triggers in Ar and N_2 gas flowing and their ability for decomposing monochlorobenzene (MCB) have been investigated. Stable nonthermal plasma could be generated from all the triggers tested in Ar flowing. However, stable plasma could be generated in N_2 flowing only when porous SIC ceramics was employed as a trigger and MCB in N_2 flowing could be decomposed almost completely under the conditions. Therefore, porous ceramics was found to be most suitable structure used as a trigger in gas phase.3)Improvement of Efficiency for Simultaneous Removal of NO_x and Diesel Particulate Matters by Microwave-induced PlasmaOxidation behavior of diesel particulate matters (DPM) and gas composition have been investigated as a function of microwave power irradiated to DPM-loaded porous SiC ceramics under 0.1% NO -10% O_2 -N_2 flowing. Additional effort has been directed to study the NO_x removal behavior by 1.0 wt% Ir/TiO_2 catalyst placed downstream from the plasma region. The amount of NO_x, formed in the downstream of the plasma region decreased markedly with increasing the microwave power, while the amounts of CO, CO_2 and H2 increased. No NO_x was detected in the effluent gas after the catalyst bet. Thus, draping of DPM by a SiC filter as well as NO, storage by suitable catalysts in the downstream and periodical irradiation of microwave to the filter are considered to be useful for simultaneous reduction of DPM and NO_x contained in the exhaust gas from diesel engine. Less

本课题主要研究了以下三个方面的内容，并取得了如下成果：1）微波诱导液相等离子体的控制及有机物的分解研究了不同陶瓷触发器在纯水、二氯乙酸（DCAA）和β-萘酚水溶液中产生的微波诱导等离子体的行为及其对这些有机物的分解能力。采用SiC陶瓷或碳块作为液相触发剂时，由于触发剂本身的部分分解，导致生成气态CO_2。从DCAA<0.8><0.2>的转化率、部分分解产物的生成量以及作为引发剂的长期稳定性等方面考虑，La_Sr_CoO_3是DCAA分解的最佳引发剂。在β-萘酚的分解反应中，FeSi具有较强的分解能力和较好的稳定性，优于其它引发剂，是一种上级引发剂 ...更多信息 研究了不同多孔陶瓷触发器产生的微波等离子体在氩气和氮气中的行为及其对一氯苯（MCB）的分解能力。在Ar流中，所有的触发器都能产生稳定的低温等离子体。而在N_2气流中，只有采用多孔SiC陶瓷作为触发器才能产生稳定的等离子体，并且在此条件下，MCB在N_2气流中几乎完全分解。因此，我们认为，3）提高微波等离子体同时脱除柴油机尾气中NO_x和颗粒物的效率研究了负载DPM的多孔SiC陶瓷在0.1% NO-10% O_2 -N_2气氛下，微波功率对柴油机尾气中颗粒物（NOx）氧化行为和气体组成的影响。2流动本文还进一步研究了置于等离子体区下游的1.0wt%Ir/TiO_2催化剂对NO_x的脱除行为。随着微波功率的增加，等离子体区下游的NOx生成量明显减少，而CO、CO_2和H_2生成量增加。催化剂负载后的废气中未检测到NO_x。因此，采用SiC过滤器覆盖NOx和NO，在下游采用合适的催化剂储存NOx，并对过滤器进行周期性的微波辐照，是同时降低柴油机排气中NOx和NOx的有效方法。少

项目成果

Y.Shimizu: "Decomposition of Toxic Halogenated Hydrocarbons by Microwave-induced Ar Plasma Generated from SiC Ceramics under Atmospheric Pressure"Electrochemistry. Vol.69, No.7. 508-515 (2001)

Y.Shimizu：“大气压下SiC陶瓷产生的微波诱导Ar等离子体分解有毒卤代烃”电化学。

Y.Shimizu: "Decomposition of Toxic Halogenated Hydrocarbons by Microwave-induced Ar Plasma Generated from SiC Ceramics under Atmospheric Pressure"Electrochemistry. Vol. 69 No. 7. 508-515 (2001)

Y.Shimizu：“大气压下SiC陶瓷产生的微波诱导Ar等离子体分解有毒卤代烃”电化学。

Y.Shimizu: "Decomposition of Chlorinated Aromatics by Microwave-induced Ar plasma Generated using SiC Ceramic Trigger under Atmospheric Pressure"Electrochemistry. Vol.71, No.10. 960-965 (2003)

Y.Shimizu：“在大气压下使用 SiC 陶瓷触发器产生的微波诱导 Ar 等离子体分解氯化芳烃”电化学。

Y.Shimizu: "Decomposition of Chlorinated Aromatics by Microwave-induced Ar Plasma Generated using SiC Ceramic Trigger under Atmospheric Pressure"Electrochemistry. Vol. 71 No. 10. 960-965 (2003)

Y.Shimizu：“在大气压下使用 SiC 陶瓷触发器产生的微波诱导 Ar 等离子体分解氯化芳烃”电化学。

Y.Shimizu: "Decomposition of Organic Compounds by Microwave-induced Plasma in Liquid Phase"Electrochemistry. Vol. 72 No. 2. 92-97 (2004)

Y.Shimizu：“液相中微波诱导等离子体分解有机化合物”电化学。