Continuous Polycrystalline Zeolitic Imidazolate Framework‐90 Membranes on Polymeric Hollow Fibers

Abstract

Headed for a membrane: Continuous, polycrystalline ZIF-90 membranes (picture, left) can be grown at 65 °C from methanolic precursor solutions on nanocrystal-seeded surfaces of poly(amide-imide) macroporous hollow fibers (right). The ZIF-90 membranes exhibit good separation properties for linear over cyclic hydrocarbons, as well as gas permeation selectivities higher than Knudsen values.

Opportunities and challenges of MOF-based membranes in gas separations

“…Another approach for MOF/polymer composite membranes is the synthesis of MOFs on polymeric membranes to produce polymeric-supported MOF membranes. Brown et al133 reported growth of ZIF-90 on poly(amide-imide) (PAI) hollow fibers by seed coating and gas separation properties of ZIF-90/Torlon membranes were reported to be modest and consistent with the previous results on ceramic-supported ZIF membranes. Li and coworkers 134 discussed that if the MOF layer is synthesized on elastic polymer substrates and used for gas separation, the elastic polymer substrates may tend to shrink and the stiff MOF layer may shatter under hydrostatic compression.…”

On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes

“…2,3 Metal–organic framework (MOF)-based membranes have been applied to the treatment of post-combustion gas mixtures (CO 2 /N 2 ) with promising results, owing to an enhanced adsorption–diffusion mechanism favouring CO 2 through the membrane. 5 Supported CAU-1 by Yin et al , 6 ZIF-7 in our previous work 7 and ZIF-90 by Brown et al 8 led to 22.8, 13.6 and 3.5 CO 2 /N 2 separation selectivities, respectively. Liu et al grew a CO 2 -selective preferentially oriented ZIF-69 membrane (CO 2 /N 2 selectivity of 6.3), 9 while Tzialla et al subsequently functionalized this ZIF-69 with a cation based ionic liquid.…”

Methane in zeolitic imidazolate framework ZIF-90: Adsorption and diffusion by molecular dynamics and Gibbs ensemble Monte Carlo

“…Further, the aldehyde group of the ZIF-90 linker interacts additionally with CO 2 [5]. However, in adsorption studies also small alcohols with a critical diameter > 4 Å could be adsorbed on ZIF-90 [6] and methane easily permeates through ZIF-90 membranes [7][8][9][10].…”