Adsorption Behavior of γ-Al2O3 Toward Heptafluoroisobutyronitrile and its Decompositions: Theoretical and Experimental Insights

IEEE Access

Dachang Chen¹  Ju Tang¹  Song Xiao¹  Yi Li¹ 

[1] School of Electrical Engineering and Automation, Wuhan University, Wuhan, China;

关键词: γ-Al₂O₃;    C₃F₇CN;    SF₆ alternative gas;    adsorption;    density functional theory;   

DOI  :  10.1109/ACCESS.2020.2975501

来源: DOAJ

【 摘 要 】

Heptafluoroisobutyronitrile (C₃F₇CN) has received extensive attention for replacing SF₆ in high voltage electrical equipment. It is necessary to assess the suitability of traditional common adsorbent activated alumina (γ-Al₂O3) used in C₃F₇CN based equipment as adsorbent. In this paper, C₄F₇ N/N₂ hybrid gas discharge test was carried out on the gas insulation performance test platform, and the decomposition products mainly included CF₄, C₂F₆, C₃F₈, CF₃CN, C₂F₄, C₃F₆ and C₂F₅CN. Secondly, gas samples were collected at different periods, and the gas before and after being adsorbed by γ-Al₂O₃ was analyzed and compared by GC-MS. Finally, based on the density functional theory, the adsorption of gas molecular on the surface of γ-Al₂O₃ was studied. The adsorption effect of γ-Al₂O₃ to C₃F₇CN, C₂F₅CN and CF₃CN is very strong, so it is difficult to be used as adsorbing material for C₃F₇CN type gas insulated equipment. However, due to the low cost of γ-Al₂O3, it can be used in waste gas treatment for new environment-friendly insulating gas.

【 授权许可】

Unknown