Efficient capture and storage of ammonia in robust aluminium-based metal-organic frameworks

Abstract

The development of stable sorbent materials to deliver reversible adsorption of ammonia (NH3) is a challenging task. Here, we report the efficient capture and storage of NH3 in a series of robust microporous aluminium-based metal-organic framework materials, namely MIL-160, CAU-10-H, Al-fum, and MIL-53(Al). In particular, MIL-160 shows high uptakes of NH3 of 4.8 and 12.8 mmol g−1 at both low and high pressure (0.001 and 1.0 bar, respectively) at 298 K. The combination of in situ neutron powder diffraction, synchrotron infrared micro-spectroscopy and solid-state nuclear magnetic resonance spectroscopy reveals the preferred adsorption domains of NH3 molecules in MIL-160, with H/D site-exchange between the host and guest and an unusual distortion of the local structure of [AlO6] moieties being observed. Dynamic breakthrough experiments confirm the excellent ability of MIL-160 to capture of NH3 with a dynamic uptake of 4.2 mmol g−1 at 1000 ppm. The combination of high porosity, pore aperture size and multiple binding sites promotes the significant binding affinity and capacity for NH3, which makes it a promising candidate for practical applications.

Harvesting Water from Air with High-Capacity, Stable Furan-Based Metal–Organic Frameworks

“…According to previous reports, it has been theorized that the angle formed between the two carboxylic acid groups is what determines the conformation of the corner-shared SBU formed in the structure . We reasoned that using the 2,5-furandicarboxylic acid linker (forms a 130° angle between its two carboxylic acids, as in MIL-160) with the long arm extension strategy would yield a MOF featuring a cis corner-shared SBU (Figure a). , …”

“…11 We reasoned that using the 2,5furandicarboxylic acid linker (forms a 130°angle between its two carboxylic acids, as in MIL-160) with the long arm extension strategy would yield a MOF featuring a cis corner-shared SBU (Figure 1a). 19,20 To test our hypothesis, we begin by synthesizing the (E)-5-(2carboxyvinyl)-2-furancarboxylic acid (H 2 FVDC) and (E,E)-3,3′-(2,5-furandiyl)bis-2-propenoic acid (H 2 FDP) linkers (Figure 1a) using the Doebner-modified Knoevenagel reaction (Sections S1−S3). 21−23 MOF-LA2-1(furan) and MOF-LA2-2(furan) were synthesized with a slight modification of the method used for CAU-10.…”

Harvesting Water from Air with High-Capacity, Stable Furan-Based Metal–Organic Frameworks

“…11 We reasoned that using the 2,5-furandicarboxylic acid linker (forms a 130° angle between its two carboxylic acids, as in MIL-160) with the long arm extension strategy would yield a MOF featuring a cis corner-shared SBU (Figure 1a). 19,20 To test our hypothesis we begin by synthesizing the (E)-5-(2-carboxyvinyl)-2-furancarboxylic acid (H2FVDC) and (E,E)-3,3'-(2,5-furandiyl)bis-2-propenoic acid (H2FDP) linkers (Figure 1a) using the Doebner modified Knoevenagel reaction (Supporting Information, SI, Sections S1, S2, and S3). [21][22][23] MOF-LA2-1(furan) and MOF-LA2-2(furan) were synthesized with a slight modification of the method used for CAU-10.…”

MFM-300(Sc): a chemically stable Sc(iii)-based MOF material for multiple applications

“…However, MFM-300(Sc) exhibits an adsorption capacity comparable to that of other MOFs with the presence of μ 2 -OH moieties, such as MIL-160, CAU-10-H, and MIL-53(Al) which adsorb 12.8, 10.0, and 3.0 mmol g −1 , respectively. 122 Moreover, MFM-300(Sc) shows an interesting dynamic behaviour for the metal–carboxylate bond that does not affect its chemical stability.…”