Study on microwave-induced non-equilibrium chemical reaction by complex permittivity analysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04781
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27030:Catalyst and resource chemical process-related
• Research Institution: National Institute for Materials Science (2023); Toyohashi University of Technology (2021-2022)
• Principal Investigator: Fujii Satoshi 国立研究開発法人物質・材料研究機構, 電子・光機能材料研究センター, NIMS特別研究員 (30598933)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: マイクロ波化学 / マイクロ波化学 / 複素誘電率測定 / 誘電損失 / 共振器

Outline of Final Research Achievements

Microwave irradiation on oxide catalysts has been shown to increase reaction rates and reduce reduction temperatures. These effects result from local or rapid heating at the particle interface between the catalyst and the pressed powder. This study aims to elucidate the mechanism of electromagnetic wave loss by measuring complex permittivity. Notably, this loss is primarily due to Joule loss in samples containing conductors with a conductivity exceeding 3000 S/m, particularly in thin films or particles. Additionally, complex permittivity measurements face challenges when sample conductivity is high or microplasma is present, leading to reduced apparent permittivity loss.

Free Research Field

マイクロ波化学

Academic Significance and Societal Importance of the Research Achievements

マイクロ波照射を触媒反応に用いる場合、触媒に形成した白金などのナノ金属に対してその導電性から非常に加熱されることが実験及び理論示すことが出来た。マイクロ波照射下における局所・高速加熱のメカニズムの一つして提案できた。