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the computational plasma model can also lead to a more informed design of the experimental plasma/catalyst system. Some design modifications of the experimental system could lead to lower overall operational costs and possible higher efficiencies. First a different discharge cooling mechanism could be implemented to eliminate the need for a recirculating chiller during continued operation at atmospheric pressure. A vortex gas flow formed via tangential gas injection would create a spiral of gas around the inner wall of the discharge tube, acting as a coolant by insulating the quartz walls from the hot plasma gas and thus preventing melting. This would lower overall operating cost by reducing electrical usage that would have been consumed by the chiller. Additionally, the vortex flow would act to stabilize the discharge in the center of the tube, which could enable successful testing at higher CO2 flow rates. Then the desired operating range for specific energy Ev = 0.3 − 1 eV/mol could be reached when CO2 flow rates are increased, potentially increasing the maximum energy efficiency achievable in the microwave plasma at atmospheric pressure. Since CO2 has strong emissions in the deep IR, Fourier Transform Infrared (FTIR) spectroscopy could be a useful tool to measure plasma temperatures directly from the CO2 emission spectra rather than relying on C2. Also, other types of metal catalysts could also be tested on different supports. Specifically the catalyst support Al2O3 has been reported to increase CO2 dissociation efficiencies. The monolith structure can also be modified with larger hole size for less gas flow constriction as gas exits the discharge tube. A larger modification to the existing system could be made through the addition of a vacuum pump to allow for operation at low pressure. As reported in literature, operating the microwave system between 100-200 torr offers the advantage of producing a non-thermal discharge which can effectively stimulate the vibrational modes of CO2 for dissociation processes. Another advantage to using a non-thermal plasma is the increased flexibility in catalyst placement. With lower gas temperatures, the catalyst 158PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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