Décomposition des molécules polyatomiques dans un réacteur à plasma hors d'équilibre. I. NH3

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Abstract
Plasmas at reduced pressure are complex non-equilibrium systems, in which several excitation modes coexist. The global reaction also take place by means of many elementary process in which reactants and products are often excited states. We establish a model of the reactor in three stages (excitation, hot recombinations, quench) which, when applied in NH3 decomposition, shows that the key reaction is (NH3, X) ~ (NH3, A, B)* ~ (NH, a 10394). We also use the theory of chemical reactivity in non-equilibrium systems in order to interpret the variation of plasma's reactivity as a function of energy repartition over the excited species. We conclude that the decomposition process is controlled by the vibrational temperature of the plasma. As the system approaches equilibrium, the decomposition rate reduces.