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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 6.22: Computational energy efficiencies for Ar flow rate of 10 slm, CO2 flow rate from 1-8 slm , and 1-2 kW of power. twice as large in the simulation as in the experimental results. While electron temperatures for experimental and computational results are close (ranging between 1-2 eV), the experimentally measured gas temperature is significantly higher than the computed gas temperature. The simulated gas temperature remains almost constant around 1000 K, presenting characteristics of a clear non-thermal discharge, as indicated by the results of Figures 6.23 and 6.24. The experimentally observed plasma temperatures would indicate a tendency towards thermal equilibrium, though. The simulated gas temperature is unbelievably low, given that the plasma was causing the quartz discharge tube to melt which occurs around 2000 K. However these results may support the argument that the C2 emission spectra is over estimating the gas temperature due to chemiluminescence, since carbon is created as a result of a chemical process. Chemiluminescence can result in an exaggerated emission intensity because of residual heat emitted from chemical reactions to produce C2, causing an overestimation of temperature. Equation 5.16 (which describes the differential equation for computing Tg), shows that the main contribution to gas heating is from elastic and inelastic collisions. 133

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