Irradiation Cracking of Sulfur Hexafluoride in Oxidizing and Reducing Atmospheres

doi:10.19894/j.issn.1000-0518.240381

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (6): 811-817.DOI: 10.19894/j.issn.1000-0518.240381

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Irradiation Cracking of Sulfur Hexafluoride in Oxidizing and Reducing Atmospheres

Ying CHEN¹, Yue ZHAO¹, Feng-Xiang MA¹, Feng ZHU¹, Meng-Hui ZHAO², He-Wen LIU²(), Zheng-Jie XU¹, Xiao-Xiao XU¹, Wei CHENG¹, Chen HANG¹

^1.Electric Power Research Institute，State Grid Anhui Electric Power Co. ，Ltd. ，Hefei 230026，China
^2.School of Chemistry and Materials Science，University of Science and Technology of China，Hefei 230026，China

Received:2024-11-23 Accepted:2025-04-24 Published:2025-06-01 Online:2025-07-01
Contact: He-Wen LIU
About author:lhewen@ustc.edu.cn
Supported by:
the State Grid Anhui Electric Power Co., Ltd. Science and Technology Project(B3120523000R);the National Natural Science Foundation of China(21871243)

Abstract

Abstract:

SF₆ is widely used in the power industry as an arc extinguishing insulating gas and is also a hazardous greenhouse gas. The degradation and resource utilization of SF₆ is an urgent issue that must be studied. The gamma irradiation of cobalt-60 radioactive source was used to degrade SF₆， and the degradation effects in oxidizing or reducing atmospheres were studied. The irradiation results of the mixed gas formed by SF₆ with oxygen or hydrogen were analyzed by fourier fransform infrared （FT-IR） spectrometer. A weak absorption peak of sulfuryl fluoride （SO₂F₂） appeared in the early stage of irradiation in hydrogen， which was formed after the reaction of SF₄ with the adsorbed water on the inner wall of the solid. The intensity of the peak did not change after all the water reacted. The absorption peak of sulfuryl fluoride increased with the increase of absorption dose in oxygen， indicating that oxygen was involved in the formation of sulfuryl fluoride. In addition， other complex oxidation products were formed， and the peak intensities were enhanced with the increase of absorbed dose. Both oxidizing and reducing atmospheres accelerated the degradation of SF₆， but the degradation rate is the fastest in hydrogen. According to the kinetic fitting results， the rate constants of SF₆ in pure gas， oxygen and hydrogen are 1.70×10^-3， 6.0×10^-3 and 13.3×10^-3 L/mol， respectively. This work not only contributes to the utilization of SF₆ resources， but also is of great significance to the realization of China's green and environmentally friendly modern power industry and the realization of the goals of “carbon peak” and “carbon neutrality”.

Key words: Sulfur hexafluoride, Gamma rays, Irradiation, Oxygen, Hydrogen, Decomposition

CLC Number:

O644

Ying CHEN, Yue ZHAO, Feng-Xiang MA, Feng ZHU, Meng-Hui ZHAO, He-Wen LIU, Zheng-Jie XU, Xiao-Xiao XU, Wei CHENG, Chen HANG. Irradiation Cracking of Sulfur Hexafluoride in Oxidizing and Reducing Atmospheres[J]. Chinese Journal of Applied Chemistry, 2025, 42(6): 811-817.

Figures/Tables 7

Fig.1 FT-IR spectra of H2/SF6 mixture gas at different absorbed doses

Table 1 IR assignment of SF6

No.	Peak position/cm^-1	Assignment
g	948.1	ν₃ as.stretching
h	615.0	ν₄ deformation
a	1 716	ν₁+ν₃ combining
b	1 584	ν₂+ν₃ combining
c	1 388	ν₁+ν₄ combining
d	1 257	ν₂+ν₄ combining
e	1 137	ν₄+ν₅ combining
f	989	ν₂+ν₆ combining

Fig.2 Differential spectra obtained from the infrared spectra of the H2/SF6 mixture at different absorption doses minus the spectrum of the unirradiated sample

Fig.3 Infrared spectra of O2/SF6 mixture gas at different absorbed doses

Fig.4 Differential spectra obtained from the infrared spectra of the O2/SF6 mixture at different absorption doses minus the spectra of the unirradiated sample

Fig.5 Infrared differential analysis of SF6 in different O2/H2 atmospheres of the same absorbed doses

Fig.6 Changes in the mass fraction of SF6 after irradiation in different atmospheres

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Irradiation Cracking of Sulfur Hexafluoride in Oxidizing and Reducing Atmospheres

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