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Research on the adsorption of environmentally friendly insulating gas C4F7N decomposed components on the surface of γ-Al2O3
High Voltage ( IF 4.4 ) Pub Date : 2022-10-19 , DOI: 10.1049/hve2.12256
Song Xiao 1 , Junyi Chen 1 , Peng Wu 1 , Qiang Yao 2 , Long Li 2 , Xuanpei Pang 1 , Shiling Zhang 2 , Xiaoxing Zhang 3 , Yi Li 1
Affiliation  

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 4C 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。
更新日期:2022-10-19
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