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high gas temperature in the experimental system provides some explanation for the lower energy efficiency values. 6.2 Plasma/Catalyst Results 6.2.1 Control Test with Uncoated Monolith Before the effects of catalyst material on CO2 dissociation can be examined, a control test using an uncoated ceramic monolith must be performed. Therefore any subsequent changes to efficiency can be accurately attributed to the Rh catalyst. In these experiments, operating conditions were repeated from the plasma-only system to include CO2 flow rates from 1-8 slm, Ar flow rates 8 and 10 slm, and power from 1-2 kW. Based on the previous results, it is assumed that variation in Ar flow rate has no significant affect on CO2 conversion. For all experiments performed, the uncoated monolith is placed approximately 25 cm downstream of the center of the discharge tube. For every change in CO2 flow rate, the previously-inserted monolith is replaced by an unused monolith. 6.2.1.1 Plasma/Monolith Efficiencies Energy efficiency for the plasma/monolith system is presented in Figure 6.15. The curve follows a similar trend as displayed in Figure 6.9, with energy efficiency increasing as specific energy decreases. Since CO2 flow rate was tested only up to 8 slm in this system, the highest energy efficiency achieved with the monolith should be lower than the η = 20% achieved for 16 slm CO2 in the pure plasma system. However, for 8 slm CO2 in the pure plasma system η = 12%, while for the plasma/monolith sytem η = 10%. Similarly at high values of Ev, η = 5% in the pure plasma system, and η = 4% in the plasma/monolith system. Hence there is a small decrease in overall energy efficiency observed for the plasma/monolith system. 125PDF Image | CO2 Conversion in a Microwave Plasma Catalyst System
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