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 6.20: Plasma/catalyst temperature results from SPECAIR simulations. Results presented for CO2 flow rates 1-8 slm, Ar flow rate 10 slm, and power from 1-2 kW. flow rate. Then using Equation 4.4 and taking the ratio of final CO flow rate to the input CO2 flow rate, the conversion efficiency is calculated. While the overall trend for simulated conversion efficiency follows the experimental results, the simulated curve is shifted towards lower efficiencies. Additional simulated operating conditions are shown at higher values of Ev (a lower CO2 flow rate), that were not experimentally tested. At these higher values of Ev for CO2 input flow of 0.5 slm, the simulated curve appears to align more closely with an extrapolation to the experimental curve for conversion efficiency. However, at low specific energy values the computational results drop nearly to zero, deviating greatly from the experimental curve. The conversion efficiency results translate directly to the energy efficiency results of Figure 6.22, via Equation 4.5. The disparity between computational and experimental energy efficiency results is very large for low values of Ev. Similarly, at high values of Ev, the model falls almost directly in line with an extrapolation to the experimental curve. These results clearly demonstrate that another mechanism, unaccounted for in the model, is responsible for CO production in the experimental system, especially at high flow rates of CO2. 131

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