Theoretical Investigation of C 4 F 7 N–CO 2 Mixture Decomposition Characteristics Under Extreme Conditions

Yuewei Wu, Jian Wu, Xiaolong Wei, Xiaochun Bai, Chen Shen, Ding De and Bin Zheng ()
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Yuewei Wu: State Grid (Xi’an) Environmental Protection Technique Center Co., Limited, Xi’an 710199, China
Jian Wu: State Grid (Xi’an) Environmental Protection Technique Center Co., Limited, Xi’an 710199, China
Xiaolong Wei: State Grid (Xi’an) Environmental Protection Technique Center Co., Limited, Xi’an 710199, China
Xiaochun Bai: State Grid (Xi’an) Environmental Protection Technique Center Co., Limited, Xi’an 710199, China
Chen Shen: State Grid Shaanxi Electric Power Research Institute, State Grid Shaanxi Electric Power Company Limited, Xi’an 710100, China
Ding De: State Grid (Xi’an) Environmental Protection Technique Center Co., Limited, Xi’an 710199, China
Bin Zheng: School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2025, vol. 18, issue 3, 1-9

Abstract: Due to their low greenhouse effect and exceptional insulating properties, C 4 F 7 N-CO 2 gas mixtures have garnered significant attention. In particular, understanding the decomposition characteristics of C 4 F 7 N-CO 2 is crucial for their practical use as an eco-friendly dielectric medium. At elevated temperatures, the pyrolysis of C 4 F 7 N produces high concentrations of CFN, CF 3 , and C 2 F 2 , along with lower levels of C 3 F 5 , C 4 F 6 N, C 2 F, and CN. A further increase in temperature may lead to the decomposition of CO 2 into CO and additional components such as C 2 , C 2 F 3 , C 3 F 4 , C 4 F 7 and C 3 F 6 , CF, CO, C 3 F 7 , C 3 F 2 , C 3 F, C 3 F 3 , C 3 F 3 N, C 3 , CF 2 , and CF 2 N. Under electrical discharge conditions, the decomposition of CO 2 becomes more pronounced, forming products like CO, C 2 O, O 2 , C 2 O 2 , and C 2 O 4 , with up to 25 decomposition components observed. These include products originated from both C 4 F 7 N and CO 2 and their combinations. In ultra-high electric field intensities, only small molecules such as O 2 , C 2 , C 3 , and N 2 are detected among the decomposition products. This study aims to provide theoretical insights and valuable data to advance research into the decomposition behavior and practical engineering applications of C 4 F 7 N-CO 2 gas mixtures under extreme conditions.

Keywords: C 4 F 7 N-CO 2 gas mixture; decomposition products; pyrolysis; electrical discharge; molecular dynamics simulations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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