Introductory Chapter: Plasma Chemistry for Better CO2 Conversion

Britun, Nikolay; Silva, Tiago

doi:10.5772/intechopen.81921

Cited by 1 publication

(1 citation statement)

References 16 publications

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“…Many different plasma sources have been investigated over a large range of pressures: from 10 to 1000 Pa with DC glow or radio frequency discharges [3][4][5][6], from few kPa to tens of kPa with RF and microwave discharges [7][8][9][10], at atmospheric pressure with gliding arc [11,12], dielectric barrier discharges [13][14][15] or micro-hollow cathode discharges [16] or even above atmospheric pressure with nanosecond discharges [17,18]. These plasma sources and others have been listed and compared in terms of conversion efficiency in several review articles [19][20][21]. Other applications of CO 2 plasmas include polymer deposition at low pressure [22][23][24], planetary atmosphere entry studies [25][26][27][28][29][30] and oxygen production from the Martian atmosphere composed of almost pure CO 2 at a few hundreds of Pa [4,31,32].…”

Section: Introductionmentioning

confidence: 99%

Oxygen atom kinetics in CO₂ plasmas ignited in a DC glow discharge

Morillo-Candas

Drag

Booth

et al. 2019

Plasma Sources Sci. Technol.

125

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Oxygen atom densities were measured in situ in a CO 2 glow discharge, at pressures between 0.2 and 5 Torr . Two measurement techniques were compared, namely optical emission actinometry (using Ar as the actinometer) and High-Resolution Two-photon Absorption Laser Induced Fluorescence (HR-TALIF) normalised to Xe, and were found to give consistent results. The variation of the atomic oxygen density with gas pressure shows two different regimes with a transition around 1 Torr. Measurements of the O atom loss frequency under plasma exposure showed that this behaviour is caused by a change in the O atom loss mechanisms, which are dominated by surface processes in our experimental conditions. The corresponding recombination probabilities on Pyrex γ O are found to vary with the gas temperature near the wall for a constant surface temperature, similarly to what has recently been obtained in pure O 2 . However, the measured values are more than two times lower than γ O obtained in a O 2 plasma in similar conditions. The O atom densities are also compared to the dissociation fraction of CO 2 determined by infra-red absorption. The obtained CO and O densities show different behaviour as a function of the energy input. The simultaneous measurement of gas temperature, electric field, O, CO and CO 2 densities and O atoms loss frequency in the same conditions provides an ideal set of constraints for validating CO 2 plasma kinetic models.

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