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2014-03-19 - Article/Dans un journal avec peer-review - Anglais - 14 page(s)

Da Ponte Silva Tiago, Britun Nikolay , Godfroid Thomas, Snyders Rony , "Optical characterization of a microwave pulsed discharge used for dissociation of CO2" in Plasma Sources Science and Technology, 23, 025009 1 - 13

  • Edition : Institute of Physics Publishing (United Kingdom)
  • Codes CREF : Spectroscopie [électromagnétisme, optique, acoustique] (DI1255), Optique (DI1250), Physique des plasmas (DI1233), Sciences exactes et naturelles (DI1000)
  • Unités de recherche UMONS : Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) Conversion of CO2 into CO and O is studied in a flowing gas surfaguide pulsed microwave discharge operating with CO2 and CO2 + N2 gas mixtures under different conditions. Optical emission spectroscopy, including actinometry (using N2), vibrational (N2 molecule) and rotational (CO and N2 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.