The decomposition rate of carbon dioxide and the generation of ozone and carbon monoxide in coaxial corona discharges fed by pure CO2 has been investigated in a dc corona discharge operated in both positive and negative polarities using FTIR spectroscopy. The degree of CO2 decomposition is found to be dependent on the voltage, U, with a maximum CO2 decomposition of nearly 10% found in a negative corona discharge for U = 7.5 kV. In all cases the amount of CO2 decomposition was lower in positive polarity discharges than in negative polarity discharges operated under same conditions. CO and ozone were found to be the main products observed in the discharges.
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Horváth et al. (2008) studied this question.
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