Highly selective adsorption of SF6 over N2 in a bromine-functionalized zirconium-based metal-organic framework

Calcium-Based Metal–Organic Framework for Efficient Capture of Sulfur Hexafluoride at Low Concentrations

“…Especially, the IAST selectivity can reach as high as 727 at y = 0.0003 and 1.0 bar, which is a new record for the SF 6 /N 2 mixture and is about 1.3 times that of the highest value (560) in the literature. 7 Different from these two mixtures, the IAST selectivity for the mixture with a higher SF 6 concentration with y = 0.1 drops about 60% with the increase of pressure to 1.0 bar. Despite this, the IAST selectivity is still as high as 325 at y = 0.1 and 1.0 bar, which is still higher than other benchmark materials such as zeolite-13X (44), 42 UiO-66-Br 2 (200), 7 HKUST-1 (74), 26 Zn-MOF-74 (46), 23 and MIL-100-Fe-(granule) (24.4), 25 as shown in Figure 5b and Table S4.…”

“…7 Different from these two mixtures, the IAST selectivity for the mixture with a higher SF 6 concentration with y = 0.1 drops about 60% with the increase of pressure to 1.0 bar. Despite this, the IAST selectivity is still as high as 325 at y = 0.1 and 1.0 bar, which is still higher than other benchmark materials such as zeolite-13X (44), 42 UiO-66-Br 2 (200), 7 HKUST-1 (74), 26 Zn-MOF-74 (46), 23 and MIL-100-Fe-(granule) (24.4), 25 as shown in Figure 5b and Table S4. These results indicate that SBMOF-1 is a new benchmark adsorbent for low-SF 6 -concentration SF 6 /N 2 separation with excellent performance.…”

“…Among them, SF 6 is the most potent greenhouse gas with an estimated lifetime between 800 and 3000 years in the atmosphere, which has a significant greenhouse effect of 22 800 times more terrible than that of CO 2 . Vast amounts of SF 6 discharging into the atmosphere may cause serious environmental issues and climate deterioration. − Generally, SF 6 is presented in a mixture containing a majority of nitrogen in industrial applications, like in a thermoacoustic insulator for equipment. − In several special cases, the volume concentration of SF 6 in the mixture is as low as 0.03% in the semiconductor industry . Besides, high-purity SF 6 is widely needed in some fields including healthcare and the mining industry .…”

“…The key lies in the development of advanced adsorbents. Besides the traditional adsorbents like activated carbon, carbon molecular sieves, zeolites such as SAPO-34, ETS-4, and DDR, − metal–organic frameworks (MOFs) offered interesting alternatives for selective gas adsorption in recent decades, owing to their tunable pore sizes, diverse functionalities, and rich specific functional sites. − Theoretical calculations and experimental studies of SF 6 adsorption have been carried out on different MOFs, for example, MOF-74, UiO-66, MIL-100, and HKUST-1 However, regardless of the fact that UiO-66-Br 2 has a high SF 6 /N 2 selectivity of 200 for the mixture with 10 vol % of SF 6 at 1 bar, the separation at a low concentration is still a practical challenge for the sake of high-efficient capture and high-purity separation.…”

CO2/N2 Separation Properties of Polyimide-Based Mixed-Matrix Membranes Comprising UiO-66 with Various Functionalities

“…The adsorption capability was poorly correlated with the accessible surface areas, possibly because none of the samples had reached CO 2 adsorption saturation at 1 bar. In contrast, although UiO-66-(OH) 2 showed reasonably high CO 2 adsorption at low partial pressure, due to its low surface area (318 m 2 /g) relative to the other samples, the slope of the isotherm indicated a faster equilibrium saturation of CO 2 adsorption than for the other adsorbents [51,57]. Nevertheless, in terms of the applicability for CO 2 adsorption in the field of post-combustion CO 2 capture, which is conducted at low partial pressure of CO 2 [58], UiO-66-NH 2 , UiO-66-Br, and UiO-66-(OH) 2 each demonstrated better CO 2 adsorption performance than UiO-66.…”