Work

Effect of ZnO/γ-Al2O3 Catalyst Packing on the Degradation of SF6 in a Dual-Stage DBD Plasma Reactor

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Sulfur hexafluoride (SF 6 ) gas is widely used in the electric power industry as an excellent insulating gas. However, SF 6 is a potent greenhouse gas, and its degradation is an ideal method for emission reduction. In the field of SF 6 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 6 gas was designed in this study. A ZnO catalyst was packed in the first-stage reactor to improve the SF 6 degradation rate, while a γ-Al 2 O 3 catalyst was packed in the second-stage reactor to optimize the product distribution. Additionally, the selectivity of SF 6 degradation products was regulated by externally adding H 2 O. Experimental results showed that under an input power of 100 W, the SF 6 degradation rate reached 100% in the ZnO/γ-Al 2 O 3 double-stage packed system, achieving complete degradation of SF 6 . As the input power increased, the energy yield showed a gradually decreasing trend. The addition of an appropriate concentration of H 2 O effectively improved both the degradation rate and energy yield of SF 6, 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 6 decomposition products in both reactors remained unchanged, including SO 2, SO 2 F 2, SOF 2, and SOF 4 . The main product in the first-stage reactor was SO 2 F 2, whereas in the second-stage reactor, SO 2 was predominant. The addition of H 2 O also effectively increased the yield of SO 2 while suppressing the formation of SO 2 F 2, which is more difficult to treat. This study provides experimental support for SF 6 exhaust gas degradation and offers a research direction for industrial applications.

Source: ACS Omega

DOI: 10.1021/acsomega.5c06029

Authors: Chi Zhang, Ying Zhang, Jianbo Shi, Huiyu Tan, Yalong Li, Lei Yu

Institutions: Electric Power Research Institute, State Grid Corporation of China (China), State Grid Hubei Electric Power Co., Ltd. (China), Hubei University of Technology

Language: English

Topic: Plasma Applications and Diagnostics

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

SDGs: Affordable and clean energy, Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,935