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Poster Session II

4:30 pm – 6:30 pm, Wednesday October 15 Session DW5 COEX, Lobby E
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Absolute densities of H and OH in spatial afterglow of atmospheric-pressure H2O/Ar plasma

Poster 20
Presenter: Koichi Sasaki (Hokkaido University)
Authors: Tsukasa Yamakawa (Hokkaido University), Yoshinobu Inagaki (Hokkaido University)

We measured the density distributions of H and OH in the jet part of an atmospheric-pressure H2O/Ar plasma with the intention of applying it to an atomic hydrogen source in catalytic synthesis of ammonia. The H density was measured by two-photon absorption laser induced fluorescence with the absolute calibration using Kr. The OH density was measured by laser-induced fluorescence spectroscopy, where the absolute OH density was estimated based on the spatial distribution and the rate coefficient of OH+OH+M→H2O2+M. When the flow rates of Ar and H2O were 2.8 and 0.034 L/min, respectively, the H density at the jet nozzle was approximately 1×1015 cm-3, while the OH density at the same position was 1×1014 cm-3. The higher H density than the OH density is preferable if we apply this plasma source to the ammonia synthesis. The decay of the H density was steeper than that of the OH density, and as a result, similar H and OH densities were observed at a distance of 2 cm from the nozzle. The steeper decay of the H density contradicts the prediction based on the rate coefficients of OH+OH+M→H2O2+M and H+H+M→H2+M.

Funding acknowledgement

This work was supported by JSPS KAKENHI 23K25860.

POSTERS (88)