2024
DOI: 10.1063/5.0188478
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Decomposition characteristics of C4F7N-based SF6-alternative gas mixtures

Wenqiang Gao,
Luisa Posada,
Vahid Shiravand
et al.

Abstract: C4F7N [2,3,3,3-tetrafluoro-2-(trifluoromethyl)propanenitrile]/CO2 gas mixtures are being developed as an eco-friendly electrical insulator to replace SF6, the most potent greenhouse industrial gaseous dielectric. However, recent studies have reported complicated and often conflicting decomposition pathways for C4F7N/CO2 gas mixtures, which has raised concerns. In this work, the decomposition characteristics of C4F7N/CO2 gas mixtures were studied comprehensively by both designed computations and experiments. Co… Show more

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Cited by 8 publications
(4 citation statements)
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“…When designing SF 6 alternatives, many properties need to be considered, including dielectric strength, environmental impact, boiling point, interactions with common materials, toxicity, and others. A current candidate is 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile (C 4 F 7 N). Its low GWP of 2400 and superior dielectric strength make C 4 F 7 N a promising alternative. However, it has to be mixed with CO 2 , O 2 , or N 2 to be used industrially due to its −4.7 °C boiling point . When decomposed, C 4 F 7 N can form many potentially harmful byproducts, including CO, CF 4 , C 2 F 4 , CF 3 CN, C 2 F 6 , C 4 F 10 , C 3 F 8 , C 3 F 6 , C 4 F 6 , and others. , Consequently, there is high demand for an analytical tool that can perform chemical diagnostics for gas preparation and can monitor trace concentrations during operation/handling/disposal to comply with quality and safety controls.…”
Section: Introductionmentioning
confidence: 99%
“…When designing SF 6 alternatives, many properties need to be considered, including dielectric strength, environmental impact, boiling point, interactions with common materials, toxicity, and others. A current candidate is 2,3,3,3-tetrafluoro-2-(trifluoromethyl) propanenitrile (C 4 F 7 N). Its low GWP of 2400 and superior dielectric strength make C 4 F 7 N a promising alternative. However, it has to be mixed with CO 2 , O 2 , or N 2 to be used industrially due to its −4.7 °C boiling point . When decomposed, C 4 F 7 N can form many potentially harmful byproducts, including CO, CF 4 , C 2 F 4 , CF 3 CN, C 2 F 6 , C 4 F 10 , C 3 F 8 , C 3 F 6 , C 4 F 6 , and others. , Consequently, there is high demand for an analytical tool that can perform chemical diagnostics for gas preparation and can monitor trace concentrations during operation/handling/disposal to comply with quality and safety controls.…”
Section: Introductionmentioning
confidence: 99%
“…After years of collective work, C 4 F 7 N gas mixtures have emerged as one of the most promising candidates for SF 6 replacement because of their high dielectric strengths, nontoxicity, relatively low liquefaction temperature, and other desired properties. Nevertheless, recent studies also reported that the aging of C 4 F 7 N gas mixtures can generate complicated aging products, such as oxyfluorides (CF 2 O, C 2 F 4 O, etc. ), small fluorocarbons (CF 4 , C 2 F 6 , C 3 F 6 , C 3 F 8 , C 4 F 10 , etc.…”
Section: Introductionmentioning
confidence: 99%
“…Anthropogenic greenhouse gas emissions represent the root cause of global warming, and reductions in non-CO 2 greenhouse gas emissions are considered a crucial way to reverse the trend. , According to the Intergovernmental Panel on Climate Change (IPCC) inventory, SF 6 , the most widely used gaseous dielectric for electrical insulation and arc quenching in power grids, is the most potent non-CO 2 industrial greenhouse gas, which has an extremely high global warming potential (GWP) of 23,500. With the growing awareness of the environmental impact of SF 6 , there have been increasing calls for the replacement of SF 6 and great efforts have been made in the search for SF 6 alternatives. …”
Section: Introductionmentioning
confidence: 99%
“…C 4 F 7 N/CO 2 gas mixtures, considered the most promising SF 6 -alternative solution, provide a good example. On one hand, C 4 F 7 N/CO 2 gas mixtures demonstrate many desirable properties critically needed in the replacement of SF 6 , such as high dielectric strength, a low GWP, a satisfactory liquefaction temperature, nontoxicity, etc., but on the other hand, issues of C 4 F 7 N/materials incompatibility due to the relatively high reactivity of C 4 F 7 N have already been reported.…”
Section: Introductionmentioning
confidence: 99%