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rates appeared to have an insignificant effect on dissociation efficiencies. Though the energy efficiency improved by almost a factor of seven over the results of Chapter IV, the inverse relationship between energy efficiency and conversion efficiency remained. Analysis of the optical emission spectra determined plasma temperature measurements, indicating thermal equilibrium between Tv and Tr. While energy was pumped into vibrational excitation of CO2, the vibrational modes quickly relaxed to translational modes. The insertion of the uncoated monolith provided a small decrease in overall efficiencies, most likely due to changing the dynamics of gas flow exiting the discharge tube. The plasma temperature measurements changed slightly as well. However the Rh catalyst resulted in the largest change, with a strong decrease in efficiencies. While the Rh/TiO2 catalyst was chosen with hopes that it would facilitate CO2 dissociation, it instead enabled the reverse reaction between CO and oxygen on the surface of the catalyst. The position of the catalyst downstream of the plasma limited any interaction between the catalyst and the excited and radical species which otherwise might have participated in CO2 dissociation. GlobalKin simulations were carried out to replicate the experimental operating conditions. The computed results for efficiencies were lower than the experimental results, particularly for high flow rates of CO2. The simulated electron temperature was higher, while the gas temperature was lower, than those provided by fitting SPECAIR simulations to the C2 spectra. The addition of surface reactions to the simulation increased CO production and showed an improvement in overall efficiency. 151PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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