C₄F₇N is considered to be the most potential alternative gas for SF₆. However, harmful decomposition by-products generated by the discharge or overheating faults will pose threat to safe operation and service life of gas insulated equipment (GIE). Herein, we investigated the adsorption performance of γ-Al₂O₃ on C₄F₇N and its decomposition products to evaluate the possibility of using it as by-products adsorbent or exhaust treatment material. It is found that γ-Al₂O₃ demonstrates superior adsorption capacity for CF₄, C₂F₆, C₃F₈, C₃F₆, C₂F₄, and keeps stable after the interaction. The first-principles calculation infers that γ-Al₂O₃ has stronger interaction with C₄F₇N, C₃F₆ and C₃F₈ than that of C₂F₄, C₂F₆ and CF₄. There exists obvious charge transfer between C₄F₇N and γ-Al₂O₃, which belongs to chemisorption. The interaction between F 2p orbital and C=C π orbital determines the gas-solid adsorption performance. The desorption properties were also explored and the recovery time was in order of CF₄ < C₂F₆ < C₂F₄< C₃F₈ < C₄F₇N < C₃F₆. Overall, the γ-Al₂O₃ is inappropriate to be used as the adsorbent for decomposition by-products of C₄F₇N gas mixture-based GIE, while it can be used as exhaust treatment material for C₄F₇N wasted gas.

中文翻译：

---

γ-Al2O3表面吸附环保绝缘气体C4F7N分解组分的研究

C ₄ F ₇ N被认为是最有潜力的SF ₆替代气体。然而，放电或过热故障产生的有害分解副产物会对气体绝缘设备（GIE）的安全运行和使用寿命构成威胁。在此，我们研究了γ -Al ₂ O ₃对C ₄ F ₇ N及其分解产物的吸附性能，以评估将其用作副产物吸附剂或尾气处理材料的可能性。发现γ -Al ₂ O ₃对CF ₄ , C表现出优异的吸附能力₂ F ₆ , C ₃ F ₈ , C ₃ F ₆ , C ₂ F ₄ , 相互作用后保持稳定。第一性原理计算推断γ -Al ₂ O _{3与C 4} F ₇ N、C ₃ F ₆和C ₃ F ₈的相互作用强于C ₂ F ₄、C ₂ F ₆和CF ₄。_{C 4} F ₇之间存在明显的电荷转移N和γ -Al ₂ O ₃，属于化学吸附。F 2p 轨道与C=C π 轨道的相互作用决定了气固吸附性能。还研究了解吸特性，恢复时间的顺序为 CF ₄  < C ₂ F ₆  < C ₂ F ₄ < C ₃ F ₈  < C ₄ F ₇ N < C ₃ F ₆。总体而言，γ -Al ₂ O ₃不适合作为C ₄ F分解副产物的吸附剂。₇ N气体混合物基GIE，同时可作为C ₄ F ₇ N废气的尾气处理材料。