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Effects of hydrocarbon contamination on ozone generation with dielectric barrier discharges

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Abstract

The increasing usage of the feed gases of lower grade liquid oxygen (LOX) containing higher levels of trace hydrocarbon impurities in dielectric barrier discharge (DBD) for ozone generation requires a better understanding of the kinetics of the by-product formation resulting from reactions involving these hydrocarbon impurities. As a case study of hydrocarbon impurities, the kinetics of CH4 conversion in DBDs and the subsequent HNO3 formation were investigated by means of gas-phase plasma diagnostics, supported by detailed process modeling, and extensive in-situ and ex-situ by-product analysis. The by-products formation in the plasma with the presence of CH4, were found to differ significantly in oxygen-fed generators as compared to generators fed with oxygen/nitrogen mixtures. The amount of HNO3 formed depends on the concentration of NO x formed in the plasma and the amount of CH4 that is converted, but not on the O3 concentration. In the present work we have investigated CH4 concentrations of up to 1.95 wt% of the feed gas. The rate of deterioration of the overall ozone generator performance was found to be affected by the concentration of nitrogen in the oxygen/nitrogen mixture.

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Author notes

  1. Guido Vezzu

    Present address: Novartis, Schaffhausen, Switzerland

Authors and Affiliations

  1. Department of Physics, Seton Hall University, South Orange, New Jersey, USA

    Jose L. Lopez & Alfred Freilich

  2. Degrémont Technologies, Ozonia, Dübendorf, Switzerland

    Guido Vezzu & Bernhard Paolini

Authors
  1. Jose L. Lopez
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  2. Guido Vezzu
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  3. Alfred Freilich
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  4. Bernhard Paolini
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Corresponding author

Correspondence to Jose L. Lopez.

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Lopez, J.L., Vezzu, G., Freilich, A. et al. Effects of hydrocarbon contamination on ozone generation with dielectric barrier discharges. Eur. Phys. J. D 67, 180 (2013). https://doi.org/10.1140/epjd/e2013-40126-2

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  • DOI: https://doi.org/10.1140/epjd/e2013-40126-2

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