Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering

N. Gatti, S. Ponduri, F.J.J. Peeters, D.C.M. van den Bekerom, T. Minea, P. Tosi, M.C.M. van de Sanden, G.J. van Rooij

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6 Citations (Scopus)

Abstract

Vibrational activation of N2 molecules in a flowing microwave plasma is investigated in the context of utilising electrical energy for chemical conversion. Spatial profiles of rotational (Tr) and vibrational (T v) temperatures are measured by Raman scattering. Maximum values of T r = 3500 K and T v = 6000 K were observed in the centre of the plasma at low pressure (50 mbar). A detailed quantification of the local energy content shows how the strong non-equilibrium character of low pressure discharges compares with a closer-to-equilibrium energy distribution at higher pressures. Measurements performed downstream of the plasma display the ability of the microwave flowing reactor to deliver up to 48% of the specific energy input (SEI) into internal degrees of freedom of the gas molecules. Specifically, 23% of the SEI is loaded into the vibrational mode, which is potentially available to enhance chemical reactivity of endothermic reactions.

Original languageEnglish
Article number055006
JournalPlasma Sources Science and Technology
Volume27
Issue number5
DOIs
Publication statusPublished - 11 May 2018

Keywords

  • microwave flowing reactor
  • nitrogen activation
  • nitrogen fixation
  • non-thermal Plasma
  • Raman scattering
  • vibrational excitation

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