An Optimised Compaction Process for Zr-Fumarate (MOF-801)

Abstract

We reported a systematic approach aimed at identifying the optimal conditions for compaction of MOF-801, a small-pore zirconium-based metal–organic framework (MOF) containing fumaric acid as the linker, that can be easily synthesised in aqueous medium. Pellets of the MOF were prepared by compressing the powder either in neat form or dry-mixed with binders (sucrose, polyvinylalcohol, polyvinylbutyral) under a range of pressures and for different times. The mechanical stability and durability of the pellets was tested by simple drop tests and shake tests, finding that addition of 5% of polyvinylbutyral was enough to produce highly resilient pellets that did not release significant amounts of powder upon cracking. The crystallinity, textural properties and CO2 adsorption performance of the MOF were successively assessed, observing the least change of the original properties in pellets compressed at 146 MPa for 15 s. Compaction at higher pressures impacted the performance more heavily, with no evident benefit from the mechanical point of view, whereas compression time did not have a relevant effect. The cyclic adsorption behaviour was tested, showing that the pellets retained as much as 90% of the CO2 working capacity, while displaying unaffected sorption kinetics, and 74% of the H2O working capacity.

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

“…2a, all of the experimental PXRD pattern diffraction peaks are well matched with the simulated pattern in previous literature. 24,26 The main diffractions peaks at 8.66 , 9.97 and 25.90 were found to be in agreement with the (111), (002) and (244) facet of Zr-MOF. 27 Additionally, the peak intensity obtained was high, indicating high crystallinity and no miscellaneous PXRD peaks were observed, suggesting the successfully synthesis of MOF-801.…”

Engineering metal–organic frameworks for adsorption-based gas separations: from process to atomic scale

“…This approach is often used to evaluate the performance of amine-based chemisorbents, [182][183][184][185] but it has been sometimes applied to MOFs as well. [186][187][188] TGA can also provide useful information about the kinetics of adsorption and desorption. 189…”

Recent advances in process engineering and upcoming applications of metal–organic frameworks

“…In [174] , pellets were prepared by mixing MOF-801 powder and 5 wt% PVA, PVB, or sucrose as a binder. The powder mixtures were compressed to 146, 292, 438, or 524 MPa for 15 s, 30 s, 2 min, 5 min, 10 min, or 15 min to make 16-mm-diameter pellets.…”