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Effect of Gas Composition on Temperature and CO 2 Conversion in a Gliding Arc Plasmatron reactor: Insights for Post-Plasma Catalysis from Experiments and Computation.

Wencong XuSenne Van AlphenVladimir V GalvitaVera MeynenAnnemie Bogaerts
Published in: ChemSusChem (2024)
Plasma-based CO 2 conversion has attracted increasing interest. However, to understand the impact of plasma operation on post-plasma processes, we studied the effect of adding N 2 , N 2 /CH 4 and N 2 /CH 4 /H 2 O to a CO 2 gliding arc plasmatron (GAP) to obtain valuable insights into their impact on exhaust stream composition and temperature, which will serve as feed gas and heat for post-plasma catalysis (PPC). Adding N 2 improves the CO 2 conversion from 4 % to 13 %, and CH 4 addition further promotes it to 44 %, and even to 61 % at lower gas flow rate (6 L/min), allowing a higher yield of CO and hydrogen for PPC. The addition of H 2 O, however, reduces the CO 2 conversion from 55 % to 22 %, but it also lowers the energy cost, from 5.8 to 3 kJ/L. Regarding the temperature at 4.9 cm post-plasma, N 2 addition increases the temperature, while the CO 2 /CH 4 ratio has no significant effect on temperature. We also calculated the temperature distribution with computational fluid dynamics simulations. The obtained temperature profiles (both experimental and calculated) show a decreasing trend with distance to the exhaust and provide insights in where to position a PPC bed.
Keyphrases
  • room temperature
  • wastewater treatment
  • carbon dioxide