Mao Hua, Wang Yan, Wang Jie, Ma Zeyao, Xia Yalong, Zeng Xiaoliang, Hu Shihong, Lan Xinsheng, Wang Fangqiang, Zhou Lin, Liu Xuewen
State Grid Sichuan Electric Power Research Institute, Chengdu, Sichuan, China.
Power System Security and Operation Key Laboratory of Sichuan, Chengdu, Sichuan, China.
Front Chem. 2025 Aug 7;13:1618268. doi: 10.3389/fchem.2025.1618268. eCollection 2025.
This study developed a ZIF-8-coated capillary gas chromatography column for the efficient separation of critical fault gases in electrical substations. By optimizing the carrier gas flow rate (3.5 mL/min) and column temperature (40°C), baseline separation of all components was achieved within 12 min, with resolution values of 0.8 and 3.8 for CH/CH and CH/CH, respectively. The 3.4 Å molecular sieve pores of ZIF-8 preferentially retained larger hydrocarbons (e.g., CH) via size-exclusion effects, while its hydrophobic surface minimized non-specific adsorption of polar molecules like CO. The low polarity of methylimidazole ligands ensured selective retention of nonpolar and weak polar gases. Remarkable reproducibility was demonstrated by retention time relative standard deviations (RSD) < 0.08% across 11 consecutive injections, confirming the coating's mechanical stability. Coupled with high-temperature resistance and rapid analysis capabilities, this column provides a reliable tool for real-time substation gas monitoring, enabling early warning of faults (e.g., arcing, overheating) and intelligent diagnostics of insulation degradation.
本研究开发了一种涂覆有ZIF-8的毛细管气相色谱柱，用于高效分离变电站中的关键故障气体。通过优化载气流速（3.5 mL/min）和柱温（40°C），在12分钟内实现了所有组分的基线分离，CH₄/C₂H₆和CH₄/C₂H₄的分离度分别为0.8和3.8。ZIF-8的3.4 Å分子筛孔通过尺寸排阻效应优先保留较大的烃类（如C₂H₆），而其疏水表面使CO等极性分子的非特异性吸附最小化。甲基咪唑配体的低极性确保了非极性和弱极性气体的选择性保留。连续11次进样的保留时间相对标准偏差（RSD）<0.08%，证明了涂层具有出色的重现性，证实了涂层的机械稳定性。结合耐高温性和快速分析能力，该色谱柱为变电站气体实时监测提供了可靠工具，能够对故障（如电弧、过热）进行早期预警，并对绝缘老化进行智能诊断。
