Abstract A hierarchical zeolite MFI has been synthesised and investigated for its potential feasibility in SF6/N2 separation. Zeolite MFI possessing a hierarchical microporous–mesoporous structure (MFI-2) displayed an enhanced SF6/N2 selectivity at 40 °C as compared to bulk MFI (MFI-1). More importantly, at both 25 and 40 °C, drastically improved SF6 adsorption kinetics were observed for MFI-2, owing to the presence of mesopores that can facilitate the transport of SF6 within the sorbent. Such improved adsorption kinetics allows a rapid adsorption–desorption cycling in an industrial process, which was proven by the breakthrough analysis. Furthermore, MFI-2 was found to have a much lower isosteric heat of adsorption than MFI-1, indicating its feasibility in the industrial operation as it does not require a large energy penalty for regeneration. Further evaluation with an idealised vacuum swing adsorption (VSA) model revealed that MFI-2 can exhibit more competitive performance at 40 °C than at room temperature.

中文翻译：

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通过分层结构的 MFI 沸石提高 SF 6 回收率

摘要 合成了分级沸石 MFI，并研究了其在 SF6/N2 分离中的潜在可行性。与本体 MFI (MFI-1) 相比，具有分级微孔-介孔结构 (MFI-2) 的沸石 MFI 在 40 °C 下显示出增强的 SF6/N2 选择性。更重要的是，在 25 和 40 °C 时，观察到 MFI-2 的 SF6 吸附动力学显着改善，这是由于中孔的存在可以促进 SF6 在吸附剂内的传输。这种改进的吸附动力学允许在工业过程中进行快速的吸附-解吸循环，这一点已通过突破性分析得到证实。此外，发现 MFI-2 具有比 MFI-1 低得多的等量吸附热，表明其在工业操作中的可行性，因为它不需要大量的能量损失来进行再生。