Effects of discharge parameters on carbon dioxide conversion in TiO2 packed dielectric barrier discharge at atmospheric pressure

A cylindrical dielectric barrier discharge reactor packed with TiO2 is developed to convert undiluted carbon dioxide (CO2) into CO and O-2 at atmospheric pressure. Basing on linear regulation of instruments, a series of typical discharge parameters have been electrically controlled and measured in an attempt to find the maximum CO2 conversion and the best energy coupling. It is discovered that CO2 conversion has a stronger correlation with apply voltage, and further research manifested that lowering feed gas flow and increasing discharge frequency contribute to higher CO2 conversion within our controllable range. After comprehensive analysis of these trends and results of subsequent experiments, the maximum CO2 conversion of 12.72% is achieved at the voltage of 22 kV, with 9.09 kHz frequency and 20 ml/min flow rate, and the highest energy efficiency of 15.80% is achieved at the voltage of 22 kV, with 8.47 kHz frequency and 20 ml/min flow rate.