High Efficient Decomposition of Environment-Polluting Gases in a Specific Reaction System

在特定反应体系中高效分解环境污染气体

• 批准号: 10650772
• 负责人: SHIMIZU Yasuhiro
• 金额: $ 2.24万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650772/
• 关键词: Micrwave-Induced Ar Plasma; Trichlorotrifluoroethane; Decomposition; SiC; LaィイD20.8ィエD2SrィイD20.2ィエD2MnOィイD23ィエD2

Our previous studies have revealed that Ar plasma could be generated from SiC ceramics under atmospheric pressure upon irradiation of microwave and this microwave-induced (MI) Ar plasma offered several advantages in decomposing trichlorotrifluoroethane (CFC113). The present study was directed to improving the MI Ar plasma processing.When LaィイD20.8ィエD2SrィイD20.2ィエD2MnOィイD23ィエD2 was used as an alternative trigger for MI Ar plasma generation, similar decomposition behavior of CFC113 could be obtained. Thus, we could confirm again that CFC113 could be decomposed more satisfactorily by MI Ar plasma, accompanied by low energy consumption and low concentration of partial decomposition products, than by its direct thermal decomposition or simple catalytic decomposition with LaィイD20.8ィエD2SrィイD20.2ィエD2MnOィイD23ィエD2.Cooperative decomposition of CFC113 was also conducted by the MI Ar plasma generated from SiC ceramics and LaィイD20.8ィエD2SrィイD20.2ィエD2MnOィイD23ィエD2 catalyst placed in the downstream of th … More e plasma zone. In comparison with the decomposition without the catalyst, the concentration of CClィイD22ィエD2FィイD22ィエD2 as a partial decomposition product in the effluent gas was approximately doubled in the microwave power range of 60-80 W, but the total concentration of partial decomposition products was decreased satisfactory above the microwave power of 100 W. Thus, it was revealed that CFC113 could be decomposed more efficiently by the cooperative decomposition. However, the decomposition efficiency decreased gradually with time, probably due to the degradation of the catalyst by HCl and/or HF produced from CFC113 in the plasma. It was suggested that the long-term stability of this reaction system could be improved by setting the catalyst (heated at 550℃) in the downstream of the plasma zone and then by removing both HCl and HF form the effluent gas before reaching the catalyst zone.The shape of the plasma generated from SiC ceramics was a streak, and therefore it is suggested that poor radical and/or ion bombardment to CFC113 is responsible for unsatisfactory decomposition efficiency of the plasma alone. In the next step, therefore, the effect of the successive double plasma reactors, namely, the usefulness of an additional plasma reactor for decomposing partial decomposition products produced by the first plasma reactor has been investigated. As a result, further improvement in decomposition efficiency could be realized.Based on the results obtained, future investigations should be directed to the development of the ceramic form of a plasma trigger with three-dimensional open-micropore structure. The generation of Ar plasma inside the micropores makes low-cost, high efficient and continuous decomposition of environment-polluting gases possible under atmospheric pressure. Less

我们以前的研究表明，Ar等离子体可以产生从SiC陶瓷在大气压下微波照射，这种微波诱导（MI）的Ar等离子体提供了几个优点，在分解三氯三氟乙烷（CFC 113）。本研究旨在改善MI Ar等离子体处理，当使用La_（10）D_（20.8）D_2Sr_（20）D_2MnO_（23）D_2作为MI Ar等离子体产生的替代触发剂时，可以获得类似于CFC 113的分解行为。因此，我们可以再次证实，CFC 113可以更令人满意地被MI Ar等离子体分解，伴随着低能量消耗和低浓度的部分分解产物，与La_2O_3 ~（2+）D_2O_3 ~（2+）D_2MnO_3 ~（2+）D_2O_3 ~（2+）D_2的直接热分解或简单催化分解相比，CFC 113的热分解效率更高。SiC陶瓷和放置在催化剂下游的La_（20. 8）Ce_（20. 2）Ce_（20. 8）D_2Sr_（20. 2）D_2MnO_（23. 3）D_2催化剂， ...更多信息 e等离子体区。与没有催化剂的分解相比，在60-80 W的微波功率范围内，作为部分分解产物的CCl-22 - 2F由此可知，通过协同分解可以更有效地分解CFC 113。然而，分解效率随着时间的推移逐渐下降，可能是由于在等离子体中由CFC 113产生的HCl和/或HF对催化剂的降解。通过对催化剂的设置，可以提高反应体系的长期稳定性在等离子体区的下游（加热到550℃），然后在到达催化剂区之前从废气中除去HCl和HF。由SiC陶瓷产生的等离子体的形状是条纹，因此认为对CFC 113的不良自由基和/或离子轰击是单独的等离子体的分解效率不令人满意的原因。因此，在下一步骤中，已经研究了连续的双等离子体反应器的效果，即，用于分解由第一等离子体反应器产生的部分分解产物的附加等离子体反应器的有用性。基于所获得的结果，未来的研究方向应该是开发具有三维开孔结构的等离子体触发器的陶瓷形式。微孔内Ar等离子体的产生，使环境污染气体的低成本、高效率、常压连续分解成为可能。少

项目成果

Yasuhiro Shimizu: "Decomposition of Trichloroethylene by Microwave-Induced Ar Plasma Generated from SiC Ceramics under Atmospheric Pressure" Denki Kagaku. Vol.66 No.10. 1018-1025 (1998)

Yasuhiro Shimizu：“大气压下 SiC 陶瓷产生的微波诱导 Ar 等离子体分解三氯乙烯”电气化学。

Y. Shimizu, Y. Akai, T. Hyodo, Y. Takao and M. Egashira: "Decomposition of Trichlorotrifluoroethane by Microwave-Induced Ar Plasma Generated from SiC Ceramics under Atmospheric Pressure"J. Electrochem. Soc.. 146(8). 3052-3057 (1999)

Y. Shimizu、Y. Akai、T. Hyodo、Y. Takao 和 M. Egashira：“常压下 SiC 陶瓷产生的微波诱导 Ar 等离子体分解三氯三氟乙烷”J。

Yasuhiro Shimizu: "Decomposition of Trichloroethylene by Microwave-Induced Ar Plasma Genarated from SiC Ceramics under Atmospheric Pressure"Denki kagaku (presently Electrochemistry). Vol.66 No.10. 1018-1025 (1999)

Yasuhiro Shimizu：“在大气压下由 SiC 陶瓷产生的微波诱导 Ar 等离子体分解三氯乙烯”电气化学（现为电化学）。

Yasuhiro Shimizu: "Decomposition of Toxic Halogenated Hydrocarbons by Microwave-Induced Ar Plasma Generated from SiC Ceramics under Atmospheric Pressure" Proc.of Italy-Japan Seminar on Functional Ceramic Materials (Setp.29,1998,Tokyo,Japan). 58-61 (1998)

Yasuhiro 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”意大利-日本功能陶瓷材料研讨会论文集（Setp.29，1998 年，日本东京）。

Makoto horiguchi: "Cooperative Decomposition of Trichloroethylene by Microwave-Induced Plasmaand Catalyst under Atomospheric Pressure"Proc. of the 1999 Joint International Meeting, Oct. 17-22, 1999, hawaii, U.S.A. (The Electrochem. Soc., inc.). (in press)

堀口诚：“大气压下微波诱导等离子体和催化剂协同分解三氯乙烯”Proc。