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Measurement of CH and CH3 Radicals in Dielectric Barrier Discharge Using Photofragmentation Laser-Induced Fluorescence

ORAL

Abstract

Non-thermal plasma technology is a novel approach for converting methane (CH4) to produce H2 or syngas for carbon neutrality. In the CH4 reforming process, it is essential to investigate the dynamics of methylidyne (CH) and methyl (CH3), the primary radicals produced in the CH4 cracking process, to achieve an deeper understanding of CH4 decomposition process. Here, we report the dynamic behavior of CH and CH3 radicals in a dielectric barrier discharge (DBD) with argon (Ar) and nitrogen (N2) dilutions. The Photofragmentation Planar Laser-Induced Fluorescence (PF-PLIF) imaging technique provided time evolution and spatial distribution of CH and CH3 radicals produced by electric discharge in DBD. The PF-PLIF results revealed that both radicals exhibited higher concentrations and more extensive spatial distributions in Ar than in N2. These results contribute to the development of efficient plasma technologies for sustainable energy applications.

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Publication: S. Nilsson, J. Ravelid, J. Park, M.S. Cha, and A. Ehn, Photofragmentation laser-induced<br>fluorescence imaging of CH3 by structured illumination in a plasma discharge, Optics Letters, 32(15), 26492−26499 (2024).<br><br>J. Park, A. Mohanan, S. Nilsson, J. Ravelid, A. Ehn, and M.S. Cha, Insights into plasma-induced methane conversion in Ar and N2 balance: CH and CH3 measurement and simulation, (In preparation).

Presenters

  • Jin Park

    1) Korea Institute of Energy Technology (KENTECH), Institute for Hydrogen Energy, Korea. 2) King Abdullah University of Science and Technology (KAUST), CERP, Saudi Arabia.

Authors

  • Jin Park

    1) Korea Institute of Energy Technology (KENTECH), Institute for Hydrogen Energy, Korea. 2) King Abdullah University of Science and Technology (KAUST), CERP, Saudi Arabia.

  • Aswath Mohanan

    King Abdullah University of Science and Technology (KAUST), CERP.

  • Sebastian Nilsson

    Combustion Physics, Department of Physics, Lund University, Sweden.

  • Jonas Ravelid

    Combustion Physics, Department of Physics, Lund University, Sweden.

  • Andreas Ehn

    Combustion Physics, Department of Physics, Lund University, Sweden.

  • Min Suk Cha

    1) Korea Institute of Energy Technology (KENTECH), Institute for Hydrogen Energy, Korea. 2) King Abdullah University of Science and Technology (KAUST), CERP, Saudi Arabia.