Abstract

By means of chemical kinetics modelling we can elucidate the main dissociation mechanisms of CO2 in a gliding arc plasmatron (GAP). We obtain good agreement between the calculated and experimental conversions and energy efficiencies, indicating that the model can indeed be used to study the underlying mechanisms. The calculations predict that vibration induced dissociation is the main dissociation mechanism of CO2, but it occurs mainly from the lowest vibrational levels due to fast thermalization of the vibrational distribution. Based on these findings, we propose ideas for improving the performance of the GAP, but testing these ideas in the simulations reveals that they do not always lead to significant enhancement, due to other side effects, thus illustrating the complexity of the process. Nevertheless, the model allows to obtain more insight in the underlying mechanisms and to identify the limitations.

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