Strong Greenhouse Gas Sf <sub> 6 </ Sub>, Sf <sub> 5 </ Sub> Cf <sub> 3 </ Sub> And Cf <sub> 4 </ Sub> Plasma Degradation And Photodegradation Process The Study

For their distinguished Global Warming Potential(GWP₁₀₀) and atmosphere lifespan, CF₄,SF₆ and SF₅CF₃ were significant in greenhouse gas research.Especially the thorough anthropogenic greenhouse gas SF₅CF₃,which was first reported in 2000, took scientists fierce debates about its sources and sinks.Dielectric Barrier Discharge was used to decompose these potent greenhouse gases. The detail of discharging character was discussed to get the optimal disposal condition.By 3000V of applied voltage,2.0 kPa SF₆ added 28.2kPa air,which the partial pressure of water vapor was 1.8 kPa,was decomposed 92%under 5 minutes' discharging;0.4 kPa CF₄ added 30 kPa Ar was decomposed 98.2%under 4 minutes' discharging;while 1.3 kPa SF₅CF₃ added 30 kPa O₂,Ar and air was not able to be detected after 80,40,and 120 seconds discharging respectively.The results showed that Dielectric Barrier Discharge is a feasible abatement way of stubborn greenhouse gases.Photochemical technology was also researched in our study,reductive free radical released by isoprene andα-pinene with UV illumination could have reaction with SF₆ and SF₅CF₃.In isoprene-SF₆ and isoprene-SF₅CF₃ system,0.13kPa SF₆ and SF₅CF₃ in 2 kPa isoprene was decomposed 18%and 45%respectively when exposed to 185nm UV light for 30 minutes.Water vapor was used to decompose SF₆ and SF₅CF₃; the experiment result showed that water vapor can not decompose SF₆ or SF₅CF₃.To tackle with the problem that organic compounds polymerized in the vessel wall,raw rubber was used to be a matrix to release free radical gradually to react with SF₆ and SF₅CF₃,which showed a 64.3%decomposition of 0.13kPa SF₅CF₃ after 30 minutes UV exposition.It proved that decomposition of SF₅CF₃ by gradual released radical from raw rubber was effective and this technology was a flexible method for decomposition of potent greenhouse gas.