Growing emissions of sulfur hexafluoride (SF6) from the power industry have created a pressing need for its efficient decomposition. This study developed a packed-bed dielectric barrier discharge (PB-DBD) plasma-catalytic system for SF6 degradation by optimizing the Si/Al ratio and calcination temperature of ZSM-5 zeolite. Under optimal conditions, ZSM-5 with a Si/Al ratio of 25 (Si/Al 25) calcined at 450 °C achieved complete degradation of 2% SF6, which was markedly higher than the 87% degradation and removal efficiency (DRE) obtained with the uncalcined catalyst. The DRE remained above 94% after 120 min of reaction, corresponding to a relative improvement of 14.9%. Mechanistic analysis revealed that calcination generates abundant oxygen vacancies (Ovac) and reactive oxygen species (ROS) on Si/Al 25, which synergistically enhance the SF6 degradation performance in the PB-DBD system. This work demonstrates that a simple calcination treatment can significantly enhance the catalytic activity and stability, offering an efficient and economically viable strategy with promising potential for industrial application.
Li et al. (Fri,) studied this question.