Experimental study of negative corona discharge in pure carbon dioxide and its mixtures with oxygen

Abstract

The products of a negative corona discharge in both pure CO2 and mixtures of CO2 + O2 have been studied using a coaxial cylindrical electrode geometry with particular emphasis on the production of ozone. The discharge current in pure CO2 was found to be highly sensitive to the presence of trace concentrations of molecular oxygen and to changes in the flow speed through the discharge. The effect of dissociative electron attachment to ozone on the discharge current was studied by measurements of ozone and CO production. The ozone concentration increases monotonically with increasing content of oxygen in the mixture with carbon dioxide, whereas the CO concentration exhibits a flat maximum for oxygen concentrations of around 4%. A simple kinetic model of the dominant chemical processes is described and compared with the experimental results.

Plasma-photocatalytic conversion of CO 2 at low temperatures: Understanding the synergistic effect of plasma-catalysis

“…The integration of plasma and solid catalysts has great potential to generate a synergistic effect, which can activate the catalysts at low temperatures and improve their activity and stability, resulting in the remarkable enhancement of reactant conversion, selectivity and yield of target products, as well as the energy efficiency of the plasma process 6 . Direct conversion of CO 2 into valuable CO and O 2 has been explored using different cold plasmas 5,[14][15][16][17][18][19][20][21][22] . However, most previous works have mainly focused on the conversion of CO 2 diluted with noble gases (e.g.…”

Optimization of CO2 Conversion in a Cylindrical Dielectric Barrier Discharge Reactor Using Design of Experiments

“…The non-equilibrium character of such plasmas could enable thermodynamically unfavorable reactions (e.g., CO 2 splitting) to occur at low temperatures (e.g., <200 8C). Up to now, different plasma sources have been used for CO 2 conversion, including dielectric barrier discharge (DBD), [8][9][10][11][12][13][14][15][16] corona discharge, [17][18][19] glow discharge, [20,21] microwave discharge, [22][23][24] radio frequency discharge, [25,26] and gliding arc discharge. [27,28] However, previous works mainly focused on the plasma conversion of CO 2 diluted with high volumes of inert gases such as helium and argon, [11,29,30] which are not favorable for industry applications due to the cost of these gases, especially helium, while direct conversion of pure CO 2 into value-added chemicals could be valuable if integrated with carbon capture or bio-oil upgrading processes.…”

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

“…More specifically, the plasma reactor has been identified as a commercially attractive alternative to chemical plants in the production of CO 2 neutral fuels due to their simplicity, compactness and low price 22 . A wide range of plasma technologies have been proposed for the dissociation of CO 2 23 , including Corona discharges 24,25,26 , nanosecond pulsed discharges 27 , micro hollow cathode discharges 28 , microplasmas 29 , dielectric barrier discharges 30,31,32,33 , gliding arcs 34,35 , and microwave plasmas 37,38 . Out of these vastly varying technologies, the microwave plasma and gliding arc have been operated with the highest power, in the kW range, and have shown the best efficiencies, 40% for a gliding arc and 60-80% for a microwave discharge.…”