Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Sismanoglu, Bogos Nubar; Cunha, C.L.A.; Gomes, Marcelo Pego; Caetano, R.; Grigorov, K. G.

doi:10.1590/s0103-97332010000400018

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…8(b). The same trend reported by using micro-discharge at medium to high pressure in argon [34]. On the other hand, a decrease in excitation temperature with an increased pressure has been reported at low-pressure argon plasma discharge [25], low power microwave plasma [31], and high pressure of in-liquid plasma in water [30].…”

Section: Considering That N(t)/u(t) Is a Standard Constant For All LIsupporting

confidence: 76%

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Rahim

Nomura

Mukasa

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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Abstract-In this study, decomposition of methane hydrate using argon plasma jet investigated in the pressure range of 0.1MPa to 2.0MPa. The plasma generated under the high-pressure condition, which is difficult to achieve when using radio frequency (RF) plasma in the liquid method. By using emission spectrometer analysis, the excitation temperature is found to increase as the gas pressure increases, whereas, it decreases as the argon flow rate increases. During the process of plasma irradiation, the required essential reactions for methane hydrate decomposition, such as methane hydrate dissociation (MHD), steam methane reforming (SMR), and methane cracking reaction (MCR) were not completely satisfied due to an insignificant amount of methane. The gas chromatography analysis confirmed that the methane cracking reaction (MCR) was only occurred to generate hydrogen and the C (s) , due to the absence of C 2 H 2 and C 2 H 4 as the byproducts. In comparison with the other primary reactions of methane hydrate decomposition, steam methane reforming reaction became dominant in converting methane into hydrogen. Although the hydrogen production efficiency is less than that of radio frequency plasma in liquid, the reduction of CO 2 by the thermal decomposition of Teflon from CO making it possible is considered as an advanced promising technique in the future.

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Section: Considering That N(t)/u(t) Is a Standard Constant For All LIsupporting

confidence: 76%

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Rahim

Nomura

Mukasa

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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“…The apparatus used to record the optical emission spectrum from the microplasma is illustrated in figure 2; this is similar to others reported [26,[29][30][31]. A pair of achromatic lenses image the microplasma emission into a multi-mode fibre.…”

Section: Methodssupporting

confidence: 54%

Radio-frequency microplasmas with energies suited to in situ selective cleaning of surface adsorbates in ion microtraps

Akhtar

Wilpers

Choonee

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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We have demonstrated a capacitively-coupled, RF microplasma inside the 3D electrode structure of an ion microtrap device. For this work, devices with an inter-electrode distance of 340 µm were used. The microplasmas were operated at Ω RF /2π = 23 MHz, in both He and He:N 2 gas mixtures, over a range of RF amplitudes (140 V to 220 V) and pressures (250 mbar to 910 mbar). Spectroscopic analysis of the He I 667 nm and Hα 656 nm emission lines yielded the gas temperature and electron density, which enabled calculation of the mean ion bombardment energy. For the range of operating parameters studied, we calculated mean He + energies to be between 0.3 eV and 4.1 eV. While these energies are less than the threshold for He sputtering of hydrocarbon adsorbates on Au, we calculate that the high energy tail of the distribution should remove adsorbate monolayers in as little as 1 minute of processing. We also calculate that the distribution is insufficiently energetic to have any significant effect on the Au electrode surface within that duration. Our results suggest that the microplasma technique is suited to in situ selective removal of surface adsorbates from ion microtrap electrodes.

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“…It was found that the emission intensity of Argon lines was from 400 to 820nm correlates with the 5p-4s and 4p-4s transition. This condition indicated a high electron temperature in the observed region [31]. It may be more efficient to identify plasmas at both low-and high-pressure plasmas.…”

Section: Experimental Procedures Figure 1 High-frequency Argon Jet Pl...mentioning

confidence: 75%

Spectroscopic Measurement of High Argon Jet Plasma Flow Rate for Methane Hydrate Decomposition

Rahim¹,

Amaliyah²,

Mandra³

et al. 2022

IJDNE

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Methane hydrate is believed to contain a massive amount of potentially extractable hydrogen gas due to methane as the main component. A high-frequency argon jet plasma method has been proposed for decomposing hydrogen content. The excitation temperature of plasma can be directly observed from atomic emission lines. This information is more efficient to characterize the plasma behavior to optimize the decomposition process. In this study, the plasma excitation temperature was determined using spectroscopy and Boltzmann’s plot with a higher argon gas flow rate. An argon gas flow rate varied from 300, 400, 500, 1000, 1500, 2000, 2500, and 3000 mL/min. It flows inside a hollow tube in the counter electrode. A 27.12MHz high-frequency power source of plasma was applied to produce jet plasma at atmospheric pressure. The excitation temperature was observed in the range of 4310K to 5133K. The highest excitation temperature of 5133K was obtained at an argon gas flow rate of 500 mL/min.

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Optical and electrical diagnostics of microdischarges at moderate to high pressure in argon

Cited by 5 publications

References 17 publications

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Radio-frequency microplasmas with energies suited to in situ selective cleaning of surface adsorbates in ion microtraps

Spectroscopic Measurement of High Argon Jet Plasma Flow Rate for Methane Hydrate Decomposition

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