SF6 is a greenhouse gas widely used in the power industry that cannot be directly emitted. This study employs a self-designed two-stage dielectric barrier discharge (DBD) plasma series method that was used to degrade SF6 gas and analyzes the effect of H2O concentration. The results indicate that the SF6 degradation rate (DR) initially increased and then decreased with the rise in the water vapor content. When the added H2O concentration increased from 0.5 to 1.5%, the degradation rate of SF6 increased from 89.49 to 100%, achieving complete degradation of SF6. However, when the H2O concentration further increases to 2.5%, the degradation rate of SF6 decreased to 92.83%. The energy efficiency of SF6 degradation in the primary reaction system first increased and then decreased with the increase of H2O concentration, while that of SF6 in the secondary reaction system first decreased and then increased. It was found that the products of SF6 were SO2F2, SO2, SOF2, and SOF4. The addition of H2O increased the selectivity of SO2 in the decomposition products to 75.17%, and inhibit the formation of SO2F2 and SOF2. This study provides experimental support for the degradation of SF6 waste gas and provides a research direction for its industrial application.
© 2024 The Authors. Published by American Chemical Society.