No abstract

No abstract

No abstract

No abstract

Carbon dioxide conversion at atmosphere pressure and low temperature has been studied in a cylindrical dielectric barrier discharge (DBD) reactor. Pure CO 2 feed flows to the discharge zone and typical filamentary discharges were obtained in each half-cycle of the applied voltage. The gas temperature increased with discharge time and discharge power, which was found to affect the CO 2 decomposition deeply. As the DBD reactor was cooled to ambient temperature, both the conversion of CO 2 and the CO yield were enhanced. Especially the energy efficiencies changed slightly with the increase of discharge power and were much higher in cooling condition comparing to those without cooling. At a discharge power of 40 W, the energy efficiency under cooling condition was approximately six times more than that without cooling. Gas flow rate was observed to affect CO 2 conversion and 0.1 L min −1 was obtained as optimum gas flow rate under cooling condition. In addition, the CO 2 conversion rate in plasma/g-C 3 N 4 catalyst hybrid system was twice times as that in plasma-alone system. In case of cooling, the existence of g-C 3 N 4 catalyst contributed to a 47% increase of CO 2 conversion compared to the sole plasma process. The maximum energy-efficiency with g-C 3 N 4 was 0.26 mmol kJ −1 at 20 W, which increased by 157% compared to that without g-C 3 N 4 . The synergistic effect of DBD plasma with g-C 3 N 4 on pure CO 2 conversion was verified.