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• The power-law that is observed between CO2 conversion (to CO) and specific en- ergy input, observed in planar configurations by others and by using a pin-pin reactor in this work, has been shown to have electrostatic underpinnings. It has been shown that the dynamics of charge on surface determine the consumption of energy in a given half-cycle and the filament distribution. Because of very rapid changes in current (few ns) a faster diagnostic than the one used in this work needs to be employed (or developed) to be used as input in the models. Also, a better imaging technique (e.g. Lichtenberg figures) needs to be employed for accurate measurements of the spatial dynamics of filaments. • In chapter four, a fluid model – code developed by Dr. M. Becker in the plasma modeling group of Priv.-Doz. Dr. Loffhagen of INP Greifswald– has been used to calculate the spatial (one dimension) and time resolved production rates of CO in a CO2 fed dielectric barrier discharge. As an input for the fluid model, rate coefficients calculated by a Boltzmann solver (electronic kinetic data supplied by Priv.-Doz. Dr. Loffhagen) were used. The calculations done using this model were able to reproduce the published experimental results. The model also predicts an asymmetry between positive and negative half cycle (in electrical characteristics and CO production), which could be attributed to slow recombination of ions in the volume of the plasma. • From the model, the electron impact dissociation was shown as the major channel of CO production. The specific energy inputs calculated are in agreement with that of the experiment, showing that the electron energy dynamics has been described accurately in the model. The match between the experimentally observed CO2 conversion and the conversion calculated from the model was shown to be better when the spontaneous dissociation of electronically excited state (with a threshold of 7.0 eV) is considered. The nature of electronic states and their effect on energy consumption in plasma needs to be studied in the future. • In chapter five the fluid model introduced in chapter four is extended to calculate the vibrational kinetics of the CO2 molecules. The vibrational kinetics are im- portant in energy efficiency of CO2 conversion. The electron density is shown to be a key parameter in determining the population of vibrationally excited states. To conserve the electron density without excessive ionization new plasma sources should be explored in future. From a purely hypothetical case, in which vibrational excitation works only favorably, it is shown that DBDs are inefficient in achieving high energy efficiency due to the large time scales involved.PDF Image | Understanding CO2 containing non-equilibrium plasmas
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