Flame bands: CO + O chemiluminescence as a measure of gas temperature

G. Raposo, A.W. van de Steeg, E.R. Mercer, C.F.A.M. van Deursen, H.J.L. Hendrickx, W.A. Bongers, G.J. van Rooij, M.C.M. van de Sanden, F.J.J. Peeters*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Carbon monoxide flame band emission (CO + O -> CO2 + h nu) in CO2 microwave plasma is quantified by obtaining absolute calibrated emission spectra at various locations in the plasma afterglow while simultaneously measuring gas temperatures using rotational Raman scattering. Comparison of our results to literature reveals a contribution of O-2 Schumann-Runge UV emission at T > 1500 K. This UV component likely results from the collisional exchange of energy between CO2(B-1) and O-2. Limiting further analysis to T < 1500 K, we demonstrate the utility of CO flame band emission by analyzing afterglows at different plasma conditions. We show that the highest energy efficiency for CO production coincides with an operating condition where very little heat has been lost to the environment prior to similar to 3 cm downstream, while simultaneously, T ends up below the level required to effectively freeze in CO. This observation demonstrates that, in CO2 plasma conversion, optimizing for energy efficiency does not require a sophisticated downstream cooling method.

Original languageEnglish
Article number374005
Number of pages13
JournalJournal of Physics D-Applied Physics
Volume54
Issue number37
DOIs
Publication statusPublished - 16 Sept 2021

Keywords

  • CO2 plasma
  • O-2 Schumann-Runge emission
  • CO flame band emission
  • chemiluminescence
  • plasma afterglow
  • gas temperature measurement
  • CARBON-MONOXIDE
  • CHEMI-LUMINESCENCE
  • SPECTRAL DISTRIBUTION
  • RATE-CONSTANT
  • SHOCK-TUBE
  • OXYGEN
  • DISSOCIATION
  • COMBINATION
  • PHOTOLYSIS
  • RADIATION

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