Abstract Adsorptive separation of SF6/N2 mixtures is an important issue since SF6 is a significant greenhouse gas. Although separation performances should be evaluated under high pressure conditions to find an efficient adsorbent candidate for pressure swing adsorption (PSA) processes, no studies on metal–organic frameworks (MOFs) have focused on SF6/N2 separation at high pressures above 1 bar. In this study, we evaluated the potential of three hydrothermally stable adsorbents, including two MOFs (UiO-66 and UiO-67) and zeolite-13X, for SF6/N2 separation under normal PSA operation pressures (∼10 bar). Interestingly, UiO-67 with a high surface area and large pore size exhibited very high SF6/N2 selectivity (30∼37) at 10 bar as well as a significantly large SF6 working capacity (5.94 mmol g−1) between 10 bar and 1 bar. Moreover, UiO-67 showed facile regeneration at the ambient temperature as well as good cyclic adsorption and desorption behavior during 20 cycles. These results show that UiO-67 is a potential adsorbent for adsorptive SF6/N2 separation.

中文翻译：

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使用锆基介孔金属有机骨架在高压下高效分离 SF6/N2

摘要 SF6/N2 混合物的吸附分离是一个重要问题，因为SF6 是一种重要的温室气体。尽管应在高压条件下评估分离性能，以找到适用于变压吸附 (PSA) 工艺的有效吸附剂候选物，但尚无关于金属有机骨架 (MOF) 的研究侧重于 1 bar 以上高压下的 SF6/N2 分离。在这项研究中，我们评估了三种水热稳定吸附剂，包括两种 MOF（UiO-66 和 UiO-67）和沸石-13X，在正常 PSA 操作压力（~10 bar）下分离 SF6/N2 的潜力。有趣的是，具有高表面积和大孔径的 UiO-67 在 10 bar 下表现出非常高的 SF6/N2 选择性（30∼37），并且在 10 bar 到 1 bar 之间显示出非常大的 SF6 工作容量（5.94 mmol g-1）。酒吧。而且，UiO-67 在环境温度下显示出容易的再生以及在 20 次循环期间良好的循环吸附和解吸行为。这些结果表明 UiO-67 是一种潜在的 SF6/N2 吸附分离吸附剂。