Theoretical study on decomposition pathways and reaction rate constants of C<sub>4</sub>F<sub>7</sub>N with O atom

Fu, Yuwei; Wang, Xinxin; Wang, Xiaohua; Yang, Aijun; Rong, Mingzhe; Duan, Jiandong

doi:10.1088/1361-6463/ab5739

Cited by 18 publications

(10 citation statements)

References 43 publications

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“…In addition, the LC50 of 10% C 4 F 7 N gas mixture is in the range of 95 500 to 100 000 ppm (parts per million, μL/L), which is classified as a nontoxic substance according to the CLP regulation 1272/2008 . Several studies have been conducted on the performance evaluation of C 4 F 7 N including insulation properties, − decomposition characteristics, − arc extinguishing performance, and toxicity , over the past three years, which confirm that C 4 F 7 N can be used as a substitute to SF 6 for medium-voltage and high-voltage applications.…”

Section: Introductionmentioning

confidence: 90%

“…18,19 The decomposition mechanism of C 4 F 7 N was also explored by several researchers using density functional theory (DFT) and reactive force field (ReaxFF). 18,20 Our group also explored the compatibility of C 4 F 7 N−N 2 gas mixture with copper and aluminum. It was found that C 4 F 7 N−N 2 gas mixture has better compatibility with heated aluminum (at 120−220 °C) than that of copper.…”

Section: Introductionmentioning

confidence: 99%

“…Both effects must be investigated for all used materials. Studies on the decomposition properties of C 4 F 7 N–CO 2 or C 4 F 7 N–N 2 gas mixtures under AC breakdown, thermal and arc-quenching conditions indicate that CF 4 , C 2 F 6 , C 3 F 6 , C 3 F 8 , CF 3 CN, C 2 F 5 CN, C 2 N 2 , COF 2 , CO, and HF are the main generated byproducts. − The generation of C 3 F 6 and CO is common for thermal decomposition conditions and CF 4 and CF 3 CN are the main products after breakdown. , The decomposition mechanism of C 4 F 7 N was also explored by several researchers using density functional theory (DFT) and reactive force field (ReaxFF). , Our group also explored the compatibility of C 4 F 7 N–N 2 gas mixture with copper and aluminum. It was found that C 4 F 7 N–N 2 gas mixture has better compatibility with heated aluminum (at 120–220 °C) than that of copper.…”

Section: Introductionmentioning

confidence: 99%

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Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Zhang

et al. 2020

ACS Omega

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C 4 F 7 N (fluorinated nitrile) has been introduced as a remarkable substitute gas for the greenhouse gas SF 6 (sulfur hexafluoride) which is used in gas-insulated equipment (GIE). Intensive investigations about the compatibility between C 4 F 7 N and materials used in GIE are required to decide their long-term behavior. In this paper, the interaction mechanism between EPDM, used as a sealing ring in GIE, and C 4 F 7 N−CO 2 was explored. The composition and morphology properties of EPDM were first revealed based on scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that EPDM rubber is incompatible with the C 4 F 7 N−CO 2 gas mixture at temperatures higher than 70 °C. There exist chemical reactions between EPDM and C 4 F 7 N, resulting in the generation of gaseous byproducts including C 3 F 6 , CF 3 H, and C 2 F 5 H and corrosion of EPDM. DFT calculation also shows that the interaction between C 4 F 7 N and EPDM could cause the dissociation of C 4 F 7 N. Relevant results provide important guidance for the engineering application of the C 4 F 7 N gas mixture.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Zhang

et al. 2020

ACS Omega

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“…Then the components and percentage of gas products of decomposition were tested and analysed by Fourier transform infrared (FTIR) spectroscopy and gas chromatography-mass spectrometry (GC-MS). On the other hand, researchers try to get the decomposition mechanism and chemical reaction kinetics of C 3 F 7 CN through simulation analysis, so as to better understand the decomposition properties of C 3 F 7 CN [35][36][37][38][39][40][41]. The main means of simulation include quantum chemistry calculations and reactive molecular dynamics.…”

Section: Decomposition Propertiesmentioning

confidence: 99%

Feasibility of C ₃ F ₇ CN/CO ₂ gas mixtures in high‐voltage DC GIL: a review on recent advances

Chen

Wang

et al. 2020

High Voltage

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With the rise of renewable energy resources, especially offshore wind power plant, the DC transmission concept has attracted more and more attention. The selection of eco‐friendly insulating gas, as most critical insulating part of gas‐insulated equipment is top priority for developing highly reliable system. Moreover, it is acknowledged that eco‐friendly C3F7CN/CO2 gas mixtures have become a potential alternative to SF6 gas due to its excellent performance. This study reviews the basic physical properties of C3F7CN gas/gas mixtures and insulation properties including the gas gap breakdown and surface flashover performance at DC, as well as lightning impulse voltage. Investigation about the gas stability is presented, including the compatibility of gas with solid materials in gas‐insulated transmission line (GIL), and the decomposition characteristics under long‐term electrical and thermal stresses. The important progress on the charge accumulation characteristics of gas–solid interface in the novel gas environment under DC voltage stress is analysed. Finally, the key issues that need to be paid attention to and further followed through regarding the application of this novel gas in GIL are summarised and put forward. This study hopefully can provide a complete reference for the development of eco‐friendly DC gas insulation equipment with C3F7CN/CO2 gas mixtures.

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“…Therefore, it is necessary to evaluate the PD and its decomposition characteristics of the gas-solid film in GIT. However, studies on PD and decomposition characteristics of C 4 F 7 N/CO 2 gas mixture mainly focus on gas phase conditions currently [26][27][28]. It is found that the decomposition of gas mainly produces fluorocarbons (CF 4 , C 2 F 6, C 3 F 8 , C 3 F 6 etc.…”

Section: Introductionmentioning

confidence: 99%

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer

Xiao,

Wang,

Ren

et al. 2024

High Voltage

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The eco‐friendly insulating gas perfluoroisobutyronitrile (C4F7N) is potentially used in gas‐insulated transformers (GIT) to replace sulphur hexafluoride (SF6). However, evaluation of the long‐term insulation reliability and gas–solid interface discharge decomposition characteristics of the gas–solid film insulation structure in GIT is indispensable. The authors simulated the gas–solid film insulation structure in GIT and explored the interface partial discharge (PD) characteristics of C4F7N/CO2 gas mixture with polyethylene terephthalate (PET). The effect of gas pressure, mixing ratio on gas–solid interface gas decomposition, PET degradation was investigated, and the interaction mechanism was analysed. It is found that the interface PD generated three degradation regions on a PET film. The gas–solid interface reaction in the electrode contact region and the discharge development trace was significantly higher than that of halation region. The content of gas decomposition products decreases with the increase of gas pressure and the PD intensity of SF6‐PET is inferior to that of C4F7N/CO2 under the same condition. Relevant results provide reference for the development and application of C4F7N/CO2 based GIT.

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Theoretical study on decomposition pathways and reaction rate constants of C₄F₇N with O atom

Cited by 18 publications

References 43 publications

Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Feasibility of C ₃ F ₇ CN/CO ₂ gas mixtures in high‐voltage DC GIL: a review on recent advances

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer

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Theoretical study on decomposition pathways and reaction rate constants of C4F7N with O atom

Cited by 18 publications

References 43 publications

Interaction Mechanism between the C4F7N–CO2 Gas Mixture and the EPDM Seal Ring

Interaction Mechanism between the C4F7N–CO2 Gas Mixture and the EPDM Seal Ring

Feasibility of C 3 F 7 CN/CO 2 gas mixtures in high‐voltage DC GIL: a review on recent advances

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C4F7N/CO2 gas mixture for eco‐friendly gas insulating transformer

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Product

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Theoretical study on decomposition pathways and reaction rate constants of C₄F₇N with O atom

Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Interaction Mechanism between the C₄F₇N–CO₂ Gas Mixture and the EPDM Seal Ring

Feasibility of C ₃ F ₇ CN/CO ₂ gas mixtures in high‐voltage DC GIL: a review on recent advances

Assessment on gas‐polyethylene terephthalate solid interface partial discharge properties of C₄F₇N/CO₂ gas mixture for eco‐friendly gas insulating transformer