Effect of Plasma-Excited Radicals Distribution on Organic Reaction Process

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02079
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Ehime University
• Principal Investigator: NOMURA SHINFUKU 愛媛大学, 理工学研究科(工学系), 教授 (20263957)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: プラズマプロセス / プラズマ放電 / LIF / 燃料合成 / 有機物分解 / ヒドロキシラジカル

Outline of Final Research Achievements

Plasma was generated between an electrode installed above the water surface and the water surface, the density of OH radicals generated by the plasma discharge was measured by the LIF method. The YAG laser excitation dye laser used as the excitation light generated 564 nm which was converted to 282 nm using a wavelength conversion unit. The generated excitation light was introduced into the plasma generation region. OH radicals are generated at the rise of the power supply voltage and then attenuated. The ground state OH radicals are generated in much greater numbers than the excited OH radicals and have a longer lifetime. Fuel synthesis and organic matter decomposition by a series of plasma discharges have been carried out, and some useful results have been obtained.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究では、水プラズマで発生する励起軌道の異なるOHラジカルの発光の測定とその寿命の測定を実施した。プラズマの発生はラジカルの高励起状態の達成が可能となるため、触媒を利用する方法が主流であった化学反応を、プラズマ界面に発生する大量の荷電粒子や中性粒子の運動を物理的に刺激することによって、低温環境下での触媒性能の発現や、触媒を必要としない科学プロセスや、酸化・還元反応に選択性を持たせる可能性があることを示した。本実験の成果は、セルロース分解で使われるセルラーゼや水素発生で使われるパラジウムなどの高価な触媒を使用しないプロセス研究に展開できる。