Abstract
Plasma technology reaches rapidly increasing efficiency in catalytic applications. One such application is the splitting reaction of CO2 to oxygen and carbon monoxide. This reaction could be a cornerstone of power-to-X processes that utilize electricity to produce value-added compounds such as chemicals and fuels. However, it poses problems in practice due to its highly endothermal nature and challenging selectivity. In this communication a glow discharge plasma reactor is presented that achieves high energy efficiency in the CO2 splitting reaction. To achieve this, a magnetic field is used to increase the discharge volume. Combined with laminar gas flow, this leads to even energy distribution in the working gas. Thus, the reactor achieves very high energy efficiency of up to 45% while also reaching high CO2 conversion efficiency. These results are briefly explained and then compared to other plasma technologies. Lastly, cutting edge energy efficiencies of competing technologies such as CO2 electrolysis are discussed in comparison.
Highlights
Electrical Energy Storage Systems, Institute for Photovoltaics, University of Stuttgart, Pfaffenwaldring 47, Abstract: Plasma technology reaches rapidly increasing efficiency in catalytic applications
The technologies included are low temperature, gas-phase CO2 electrolysis [20], high te perature CO2 electrolysis in a solid oxide electrolysis cell [21], a thermochemical appro (Reverse Water Gas Shift, reverse water gas shift (RWGS)) [22] and the plasma approach reported in this wo
The presented glow discharge plasma reactor achieves a competitive CO2 conversion of 27% and energy efficiency of 42%. This is a respectable performance since the process was running at ambient pressure
Summary
It was measured by an ibrated using a displacement cylinder. The exhaust gas was characterized using non-disanalogue rotameter and adjusted using a needle valve. The assembly was calibrated using infrared sensorsThe (SmartGas. Germany); measurements at a a persive displacement cylinder. The gas sensors placed m downstream from the reactor in the current-limitexhaust gas ing driver circuit. Power was provided to the electrodes by a custom current-limiting driver circuit. Mean burn(up voltage of the discharge and mean were delivers direct current ignition to 25 kV). Is sustaining of the current discharge (
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