All-Nanoporous Hybrid Membranes: Redefining Upper Limits on Molecular Separation Properties
New membrane-based molecular separation processes are an essential part of the strategy for sustainable chemical production. A large literature on "hybrid" or "mixed-matrix" membranes exists, in which nanoparticles of a higher-performance porous material are dispersed in a polymeric matrix to boost performance. We demonstrate that the hybrid membrane concept can be redefined to achieve much higher performance if the membrane matrix and the dispersed phase are both nanoporous crystalline materials, with no polymeric phase. As the first example of such a system, we find that surface-treated nanoparticles of the zeolite MFI can be incorporated in situ during growth of a polycrystalline membrane of the MOF ZIF-8. The resulting all-nanoporous hybrid membrane shows propylene/propane separation characteristics that exceed known upper-bound performance limits defined for polymers, nanoporous materials, and polymer-based hybrid membranes. This serves as a starting point for a new generation of chemical separation membranes containing interconnected nanoporous crystalline phases.
F. Rashidi et al., "All-Nanoporous Hybrid Membranes: Redefining Upper Limits on Molecular Separation Properties," Angewandte Chemie - International Edition, vol. 58, no. 1, pp. 236-239, Wiley-VCH Verlag, Jan 2019.
The definitive version is available at https://doi.org/10.1002/anie.201811629
Chemical and Biochemical Engineering
Keywords and Phrases
Membranes; Mixed-Matrix; Olefin; Separation
International Standard Serial Number (ISSN)
Article - Journal
© 2019 Wiley-VCH Verlag, All rights reserved.
01 Jan 2019