An investigation of CO2 splitting using nanosecond pulsed corona discharge: effect of argon addition on CO2 conversion and energy efficiency

摘要

The plasma chemical splitting of carbon dioxide (CO2) to produce carbon monoxide (CO) in audpulsed corona discharge was investigated from both an experimental and a numerical standpoint.udHigh voltage nanosecond pulses were applied to a stream of pure CO2 and its mixture with argon,udand the gaseous products were identified using Fourier transform infrared spectroscopy. Due to theudshape of pulses, the process of CO2 splitting was found to proceed in two phases. The first phase isuddominated by ionization, which generates a high electron density. Then, during the second phase,uddirect electron impact dissociation of CO2 contributes to a large portion of CO production.udConversion and energy efficiency were calculated for the tested conditions. The conversionsudachieved are comparable to those obtained using other high pressure non-thermal discharges, such asuddielectric barrier discharge. However, the energy efficiencies were considerably higher, which areudfavorable to industrial applications that require atmospheric conditions and elevated gas flow rates.