Journal
PLASMA SOURCES SCIENCE & TECHNOLOGY
Volume 23, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0963-0252/23/2/025009
Keywords
CO2 dissociation; microwave discharge; optical emission spectroscopy; OES; actinometry; nitrogen
Categories
Funding
- Belgian Government
- Walloon Region (DGO6) through the Opti2mat program
- Gazton project
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Conversion of CO2 into CO and O is studied in a flowing gas surfaguide pulsed microwave discharge operating with CO2 and CO2 + N-2 gas mixtures under different conditions. Optical emission spectroscopy, including actinometry (using N-2), vibrational (N-2 molecule) and rotational (CO and N-2 molecules) analysis are utilized. Both time-and space-resolved measurements are performed. The results show the essential changes of the CO2 conversion rate, its energetic efficiency, and the gas and vibrational temperatures along the gas flow direction in the discharge. The spatial distribution of the power absorbed in the plasma is analyzed. It is also confirmed that the vibrational excitation is a key factor in the CO2 dissociation process in this type of plasma. It is suggested that the obtained dissociation rates can be further optimized by varying the gas composition, as well as the power applied to the discharge.
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