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

Research output: Contribution to journalArticleAcademicpeer-review

4 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.

LanguageEnglish
Article number055006
JournalPlasma Sources Science and Technology
Volume27
Issue number5
DOIs
StatePublished - 11 May 2018

Fingerprint

nitrogen plasma
Raman spectra
microwaves
low pressure
excitation
endothermic reactions
electric power
energy
molecules
vibration mode
energy distribution
reactivity
degrees of freedom
reactors
activation
profiles
gases
temperature

Keywords

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

Cite this

Gatti, N., Ponduri, S., Peeters, F. J. J., van den Bekerom, D. C. M., Minea, T., Tosi, P., ... van Rooij, G. J. (2018). Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering. Plasma Sources Science and Technology, 27(5), [055006]. DOI: 10.1088/1361-6595/aabd60
Gatti, N. ; Ponduri, S. ; Peeters, F.J.J. ; van den Bekerom, D.C.M. ; Minea, T. ; Tosi, P. ; van de Sanden, M.C.M. ; van Rooij, G.J./ Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering. In: Plasma Sources Science and Technology. 2018 ; Vol. 27, No. 5.
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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.",
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Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering. / Gatti, N.; Ponduri, S.; Peeters, F.J.J.; van den Bekerom, D.C.M.; Minea, T.; Tosi, P.; van de Sanden, M.C.M.; van Rooij, G.J.

In: Plasma Sources Science and Technology, Vol. 27, No. 5, 055006, 11.05.2018.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Gatti,N.

AU - Ponduri,S.

AU - Peeters,F.J.J.

AU - van den Bekerom,D.C.M.

AU - Minea,T.

AU - Tosi,P.

AU - van de Sanden,M.C.M.

AU - van Rooij,G.J.

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N2 - 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.

AB - 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.

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Gatti N, Ponduri S, Peeters FJJ, van den Bekerom DCM, Minea T, Tosi P et al. Preferential vibrational excitation in microwave nitrogen plasma assessed by Raman scattering. Plasma Sources Science and Technology. 2018 May 11;27(5). 055006. Available from, DOI: 10.1088/1361-6595/aabd60