Decomposition of the most potent greenhouse gas (GHG) sulphur hexafluoride (SF6) using a dielectric barrier discharge (DBD) plasma



A DBD method has been developed to decompose sulphur hexafluoride (SF6) nearly 100% under conditions close to the exhaust gas in industries with energy efficiency of 0.015–0.15 GJ/ton carbon dioxide (CO2) equivalent, 1–2 orders of magnitude higher than CO2 capture and sequestration from power generation boilers. A typical test condition was SF6: 820 ppm; CO2/air: 50/50; gas flow rate: 623 mL/m at 25°C; AC voltage: 17–23 kV p–p; AC frequency: 7 kHz. The success of this project was due to the development of highly effective star-shaped discharge elements and an improved design of the DBD system, that is mode of applying voltage, the physical aspects of the reactor.