Hybridizing zeolite MFI nanosheets with PTMSP membranes for enhanced butane isomer separations

2D MOFs and Zeolites for Composite Membrane and Gas Separation Applications: A Brief Review

“…Leveraging zeolites with superior mechanical traits relative to polymer matrices underscores the alterations in mechanical characteristics within zeolite-filler MMMs. In the context of MMMs synthesized using PTMSP and MFI nanosheets (Figure G), cross-sectional SEM images affirm the successful creation of the MMM, with fillers in the polymer matrix maintaining orientation despite the substantial filler content . Consequently, Figure H presents an enhancement in the mechanical properties of MMMs as measured by increasing zeolite content.…”

“…In the context of MMMs synthesized using PTMSP and MFI nanosheets (Figure 4G), cross-sectional SEM images affirm the successful creation of the MMM, with fillers in the polymer matrix maintaining orientation despite the substantial filler content. 15 Consequently, Figure 4H presents an enhancement in the mechanical properties of MMMs as measured by increasing zeolite content. Paradoxically, despite the augmented mechanical properties, the composite films with substantial zeolite concentrations also exhibit flexibility, even at elevated filler loads (Figure 4I).…”

“…Consequently, MMMs incorporating isotropic particles typically exhibit a moderate enhancement in both permeability and selectivity (Figure F). However, due to the tendency of fillers to aggregate, the filler content is commonly limited to below 30 wt % to avert the creation of nonselective paths. , This limitation results in the performance of MMMs with isotropic particles falling short of the intrinsic capabilities of the fillers yet surpassing that of pure polymer membranes.…”

“…(G) Cross-sectional SEM images of MMM with 2D nanosheet filler and (H) their mechanical stability test result. Reproduced with permission from ref . (I) Three-point bending test image showing the flexibility of high 2D-zeolite-loaded MMM.…”

“…At the same time, permeable gas can easily permeate through the composite membranes, which can significantly enhance gas selectivity based on diffusion pathway difference. Moreover, two-dimensional (2D) fillers can improve mechanical strength, such as stiffness and modulus, allowing MMM fabrication with high-loading fillers. , The layered structure of 2D fillers can decrease the occurrence of defects and imperfections compared to isotropic particles. Consequently, this feature enhances the uniformity and predictability of separation performance.…”