Mixed matrix membranes for gas separation with special nanoporous fillers

Abstract

Special nanoporous fi llers for enhancing the gas separation performance of mixed matrix membranes (MMMs) are addressed in this work. The incorporation of small amounts of ordered mesoporous silica spheres (MSS) or exfoliated layered microporous titanosilicate UZAR-S1 (obtained from layered material JDF-L1) into a commercial polysulfone (PSF) membrane matrix was successfully carried out. The obtained results in terms of the separation of H2/CH4 and CO2/N2 mixtures were compared to those achieved with special fillers in the literature, such as mesoporous molecular sieves, lamellar zeolites and metal-organic frameworks. 8 wt.% MSS–PSF MMMs gave rise to H2/CH4 and CO2/N2 selectivities of 79.2 and 36.0 with H2 and CO2 permeabilities of 26.5 and 12.6 Barrer, respectively. 4 wt.% UZAR-S1-PSF MMM gave rise to H2/CH4 selectivity of 69.2 with H2 permeability of 11.5 Barrer.