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CO2 Conversion in a Microwave Plasma Catalyst System

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CO2 Conversion in a Microwave Plasma Catalyst System ( co2-conversion-a-microwave-plasma-catalyst-system )

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Figure 6.15: Energy efficiency of CO2 dissociation with uncoated monolith. All operating conditions of CO2 flow rate, 1-8 slm, are displayed for two different Ar flow rates (8 slm = • , 10 slm = 􏱈) and the corresponding power levels from 1-2 kW. Conversion efficiency is displayed in Figure 6.16. The same small decrease in conversion efficiency is observed here when compared to the pure plasma system. The highest conversion rate for 1 slm CO2 at 1.5 kW of power is near 35%, while the same operating condition in the pure plasma system reaches about 45%. The lowest conversion rate for 8 slm CO2 is about 10%, while at the same CO2 flow rate in the pure plasma system α = 15%. These results conclude that the presence of the ceramic monolith has a small but obvious effect on CO2 conversion. An examination of the optical emission spectrum may provide some insight into this phenomena. 6.2.1.2 Plasma/Monolith Temperatures In a similar method described in Section 6.1, the emission spectrum of the C2 Swan system is evaluated to determine plasma temperature measurements. Figure 6.17 shows the temperature results from matching simulated SPECAIR spectra to experimental spectra. While the vibrational temperature appears to remain unchanged at 8000 K, the electronic and rotational temperatures have experienced some changes in 126

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