Preparation of Ni-MOF-74 membrane for CO2 separation by layer-by-layer seeding technique

Investigating the influence of diffusional coupling on mixture permeation across porous membranes

“…If correlation effects are completely ignored, and the uncoupled Eq. (8) are used, then the separations are indeed H 2 -selective as concluded by Lee et al [47]. Experimental verifications of our predictions are warranted, in view of significantly higher permeabilities of NiMOF-74 membranes, by about two orders of magnitude, than materials such as ZIF-8, SAPO-34, and DDR [18].…”

“…To demonstrate this, we consider separation of H 2 /CO 2 and CH 4 /CO 2 mixtures using NiMOF-74 membranes, that has been recently prepared using a layer-by-layer seeding technique [47]. NiMOF-74 has 1D hexagonal-shaped channels of 11Å size (cf.…”

“…12a). From the unary permeance data at an upstream pressure of 0.1 MPa, the S perm values for H 2 /CO 2 mixture is 9.1, leading Lee et al [47] to conclude: ''high H 2 /CO 2 ideal selectivity can be obtained for NiMOF-74 membranes''. We shall demonstrate that an analysis of permeation of H 2 /CO 2 mixtures across NiMOF-74 will lead us to entirely different conclusions due to a combination of two separate factors: (1) the mixture adsorption being strongly in favor of CO 2 by a factor of 100-500 (see IAST calculation data for S ads in Figs.…”

Controlling the size and shape of Mg-MOF-74 crystals to optimise film synthesis on alumina substrates

“…Currently only two studies on the fabrication and testing of M-MOF-74 membranes have been published. In the first, Lee et al used layer-by-layer seeding, followed by secondary growth to produce Ni-MOF-74 membranes on flat disc -alumina substrates for range of gas separations such as H2, CO2, N2 and CH4 30 . The films required 72 hours of synthesis, resulting in membranes between 10 and 25 µm thick.…”

Recent developments in membranes for efficient hydrogen purification

“…This process resembles the layer-by-layer assembly using polyanions and polycations. Lee et al prepared a Ni-MOF-74 membrane via the step-by-step seeding, and the membrane showed an extremely high H 2 permeance of 37920 GPU with the H 2 /CO 2 ideal selectivity of 9.1 at 1 bar and 298 K[130].…”