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Investigation of Impurity Gas Cracking Catalysts for Tokamak Exhaust Gas Processing Systems
https://repo.qst.go.jp/records/2002412
https://repo.qst.go.jp/records/2002412f2186520-8ad0-4720-acf5-d04155c68ea1
| アイテムタイプ | 会議発表用資料 / Presentation(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2025-09-30 | |||||||
| タイトル | ||||||||
| タイトル | Investigation of Impurity Gas Cracking Catalysts for Tokamak Exhaust Gas Processing Systems | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6670 | |||||||
| 資源タイプ | conference poster | |||||||
| 著者 |
枝尾 祐希
× 枝尾 祐希
|
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| 抄録 | ||||||||
| 内容記述 | In a fuel cycle system for fusion demonstration reactor (DEMO), a palladium diffuser separates unburned fuel gas and impurity gas discharged from the reactor for the purpose of fuel recycling. Among the separated impurity gases, hydrocarbons and water vapor contain tritium in their molecular structures, so they are converted to tritium in the form of hydrogen molecules in the impurity conversion system in the Tokamak Exhaust Processing system (TEP), and then reused as fuel. Impurity gas containing tritium is converted using a catalytic reaction, but since it requires additional gas according to various impurity gases for conversion, it is composed of a multi-step conversion system, and the entire impurity conversion system is complicated. On the other hand, it is difficult to control the type and concentration of additive gases for impurity gases whose composition changes, and the use of additive gases should be avoided as much as possible. We are considering converting it to tritium in the form of hydrogen molecules by reaction between impurity gas species. Therefore, we are studying the rationalization of the impurity gas conversion system by understanding the competitive reaction on the catalyst and the reaction product gas that occur between methane, oxygen, and water vapor, which are the main impurity gases that are expected. In particular, the conversion of tritiated methane, which is the most difficult of the impurity gases to convert, is the key to system rationalization. In this study, we use (1) methane oxidation (CH4 + 2O2 → CO2 + 2H2O), (2) steam reforming (CH4 + H2O → CO + 3H2), and (3) water-gas shift reaction (CO + H2O → CO2 + H2), to clarify the catalysts, reaction temperatures, and gas compositions that are effective for methane conversion. The purpose of this study is to simplify the TEP. In the experiment, methane, water vapor, and oxygen, which are assumed to be impurity gases, were used as reaction gases. The reaction gas was passed in a reactor packed with a catalyst, and the gas component at the outlet of the catalyst reactor was measured with a gas chromatograph, and the conversion rate of methane was evaluated. In this presentation, we present the results of analyzing the methane conversion rate and its reaction product gas in various competitive reactions that occur under various conditions with different temperatures, concentrations, and compositions. | |||||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||||
| 内容記述 | 14th International Conference on Tritium Science and Technology (Tritium2025)での研究発表 | |||||||
| 発表年月日 | ||||||||
| 日付 | 2025-09-22 | |||||||
