Zhang Chi, Zhang Ying, Shi Jianbo, Tan Huiyu, Li Yalong, Yu Lei
Electric Power Research Institute, State Grid Hubei Electric Power Corporation Limited, Wuhan 430077, China.
Hubei Key Laboratory of Electric Power Digital and Intelligent Carbon Monitoring and Collaborative Emission Reduction, State Grid Hubei Electric Power Corporation Limited, Wuhan 430077, China.
ACS Omega. 2025 Sep 10;10(37):43034-43042. doi: 10.1021/acsomega.5c06029. eCollection 2025 Sep 23.
Sulfur hexafluoride (SF) gas is widely used in the electric power industry as an excellent insulating gas. However, SF is a potent greenhouse gas, and its degradation is an ideal method for emission reduction. In the field of SF degradation, due to the harsh decomposition conditions, it is often difficult to achieve both a high degradation rate and favorable product distribution. To address this issue, a double-stage dielectric barrier discharge (DBD) series degradation experimental platform for SF gas was designed in this study. A ZnO catalyst was packed in the first-stage reactor to improve the SF degradation rate, while a γ-AlO catalyst was packed in the second-stage reactor to optimize the product distribution. Additionally, the selectivity of SF degradation products was regulated by externally adding HO. Experimental results showed that under an input power of 100 W, the SF degradation rate reached 100% in the ZnO/γ-AlO double-stage packed system, achieving complete degradation of SF. As the input power increased, the energy yield showed a gradually decreasing trend. The addition of an appropriate concentration of HO effectively improved both the degradation rate and energy yield of SF, with the maximum energy yields of the two-stage reactors reaching 23.9 and 17.9 g/kWh, respectively. With regard to decomposition products, the types of SF decomposition products in both reactors remained unchanged, including SO, SOF, SOF, and SOF. The main product in the first-stage reactor was SOF, whereas in the second-stage reactor, SO was predominant. The addition of HO also effectively increased the yield of SO while suppressing the formation of SOF, which is more difficult to treat. This study provides experimental support for SF exhaust gas degradation and offers a research direction for industrial applications.
六氟化硫（SF₆）气体作为一种优良的绝缘气体在电力工业中被广泛应用。然而，SF₆是一种强效温室气体，其降解是一种理想的减排方法。在SF₆降解领域，由于分解条件苛刻，往往难以同时实现高降解率和良好的产物分布。为解决这一问题，本研究设计了一种用于SF₆气体的双级介质阻挡放电（DBD）串联降解实验平台。在第一级反应器中装填ZnO催化剂以提高SF₆降解率，而在第二级反应器中装填γ -Al₂O₃催化剂以优化产物分布。此外，通过外部添加·OH来调控SF₆降解产物的选择性。实验结果表明，在输入功率为100 W时，ZnO/γ -Al₂O₃双级装填系统中SF₆降解率达到100%，实现了SF₆的完全降解。随着输入功率增加，能量产率呈逐渐下降趋势。添加适当浓度的·OH有效提高了SF₆的降解率和能量产率，两级反应器的最大能量产率分别达到23.9和17.9 g/kWh。关于分解产物，两个反应器中SF₆分解产物的种类保持不变，包括SO₂、SOF₂、SO₂F₂和SOF₄。第一级反应器中的主要产物是SOF₂，而在第二级反应器中，SO₂占主导。添加·OH还有效提高了SO₂的产率，同时抑制了更难处理的SOF₄的生成。本研究为SF₆废气降解提供了实验支持，并为工业应用提供了研究方向。
