Keywords

excitation energies, atomic and molecular collisions, transfer reactions, dissociation energy, nitrous oxide, reaction mechanisms, reaction rate constants, chemical reaction dynamics, two body reaction, plasmas

Abstract

200-600 ppm of CO inhibit NO conversion in nonthermal Ar plasma, but do not produce ⁠N₂O. However, 1.01% of CO has no effect on NO conversion, but produces ⁠N₂O. In general, N₂O conversion in Ar plasma decreases with increasing CO concentration. These experimental results cannot be explained by charge transfer reactions of Ar⁺⁠. Selectivity analysis of all excited states of Ar possibly contributing to NO_x conversion without and with CO suggests that only Ar(³P₂) contributes to NO_x conversion and CO dissociation. A kinetic model of 43 reactions is required to model NO conversion or N₂O conversion in Ar without CO, whereas 81 reactions are required to model NO conversion and N₂O conversion in Ar with CO. At constant gas pressure, a single set of model parameters can predict NO conversion or N₂O conversion without and with CO. All experimental results can be explained using a reaction mechanism in which excited neutral states of Ar are the only active species, which supports the conclusion that cations have a negligible impact on these nonthermal plasma reactions.

Original Publication Citation

Gui-Bing Zhao, Morris D. Argyle, Maciej Radosz; Effect of CO on NO and N2O conversions in nonthermal argon plasma. J. Appl. Phys. 1 June 2006; 99 (11): 113302. https://doi.org/10.1063/1.2197067