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PPM-level concentrations of CO 2 are added to NO/N 2 mixtures to determine the effect of CO 2 on plasma generation and to investigate the mechanism of CO 2 reactions. Addition of 599.9 ppm CO 2 does not affect the electric discharge in NO x in N 2 nonthermal plasma. However, CO 2 slightly dissociates, with CO 2 conversion reaching a maximum of about 5.5% at the power input at which NO conversion ceases. NO(A), the first-excited electronic state of NO, is detected by corona-induced optical emission and is found to contribute to CO 2 dissociation. A kinetic model including 38 reactions is required to adequately model decomposition of NO x and CO 2 in the presence of CO 2 . About 18% of the NO(A) that is formed reacts with CO 2 to form NO, CO, and O.
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Zhao et al. (2005) studied this question.
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