Study On Carbon Dioxide Decomposition Via Dbd Plasma

As the main greenhouse gas and the most abundant C1 resources, carbon dioxide utilization research has attracted more and more attention. Conventional carbon dioxide decomposition process not only needs high-temperature, catalysts and gas separation membranes, but also needs input of light, electricity or other energy. Moreover, the conventional process has many shortages, such as rigorous operating conditions, highly demanding on the reaction equipment, a poor decomposition result. In contrast, cold plasma, which has a unique non-equilibrium character, make the decomposition of carbon dioxide achieved in mild conditons as the temperature and pressure, which has gradually become the hot spot of research.In this paper, carbon dioxide decomposition via dielectric barrier discharge (DBD) plasma was studied. The effects of the plasma generator parameters, tubular quartz dielectric barrier discharge reactor parameters, the inert gas and the porous material on the CO2 decompostion had been investigated. As for plasma generator parameters, the effect of power, frequency, duty ratio of the power supply, pulse discharge on carbon dioxide decomposition had been investigated. With the increase of input current, CO2 conversion and CO selectivity increase. As for reactor parameters, the effect of the different inner electrode material, discharge interval length, discharge gap distance, dielectric thickness, multi-stage discharge on the reaction had been investigated. The results indicated that using copper electrode, a large discharge interval length, appropriate distance of discharge gap, small dielectric thickness would enhance the reaction result. Multi-stage discharge would increase the CO2 conversion, while had little effect on CO selectivity.In addition, the effects of the inert gas and porous materials on the reaction were investigated. The results showed that the addition of inert gas and a suitable porous material can improve the reaction result. CO selectivity can be increased by adding certain amount of inert gas in CO2 or erythorbic acid supported on B-silica gel in discharge interval. The reason is not clear and needs to be investigated further.