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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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of CO2, the conversion efficiency increases as operating pressure decreases. This trend is expected based on the high energy efficiencies of CO2 dissociation reported for low pressure microwave discharges. The collision frequency necessarily decreases with pressure, and with less collisions there is less energy transfer between electrons and heavy particles. Hence, the discharge moves to further non-equilibrium at lower pressure which results in more efficient CO2 dissociation and a greater conversion degree. As already discussed in Section 3.2 non-equilibrium discharges are uniquely effective at stimulating the vibrational modes of CO2, resulting in efficient dissociation processes. 6.4 Discussion 6.4.1 Experimental Results The follow section will provide a summary of the MS results for all three tests of the plasma alone, the plasma/monolith, and the plasma/catalyst systems. There will also be a more detailed look at the temperature results for each case. First a summary of energy efficiency, η, and conversion efficiency, α, is given in Figure 6.27. A clear decreasing trend in both η and α is evident when the uncoated-monolith is inserted and more so once the catalyst is used. The plasma temperature results can provide some explanation to this phenomenon, with temperature changes for each experiment more clearly analyzed in Figures 6.28 - 6.30. As shown in Figure 6.28, the electronic temperature for the plasma/monolith and plasma/catalyst systems is obviously lower than for the original discharge. Though the vibrational temperature in Figure 6.29 does not show any clear pattern between the three experiments, all temperatures seem to oscillate mostly between 7500-8000 K. Figure 6.30 shows that the rotational temperatures for the plasma/monolith and plasma/catalyst systems are slightly higher than the pure plasma system, indicating 138

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