Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4987248 | Chemical Engineering Research and Design | 2017 | 31 Pages |
Abstract
Zeolitic imidazolate frameworks (ZIF) have been showed as potential active inorganic fillers in high-performance gas separation membranes. Among them, zeolitic imidazolate framework-12 crystals were synthesized as a porous filler material by alcohol-based solution method using benzimidazole-toluene interactions and they were incorporated into a commercial glassy polyimide Matrimid 5218 with various ZIF-12 loadings (0, 10, 20, 30, 40 wt.%), as the continuous phase. As-synthesized ZIF-12 was characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), multipoint Brunauer-Emmett-Teller (BET) surface analysis, Fourier Transform Infrared Spectroscopy (FT-IR) and Thermogravimetric Analysis (TGA). SEM images of ZIF-12 particles assert regular external surfaces with a rhombic dodecahedron structure. Matrimid mixed matrix membranes (MMMs) loaded with different amounts of ZIF-12 were prepared by solution casting method and characterized by XRD, FT-IR, TGA and SEM analyses. Our findings showed that there was a good dispersion and wetting of ZIF-12 particles in the continuous phase. Gas transport properties of the membranes were investigated by single gas permeation experiments of H2, CO2 and CH4 at 4 bar feed pressure and 35 °C. The permeability values increased as the ZIF-12 loading increased up to 20 wt.%. However, at higher loadings, 30 and 40 wt.%, the permeability decreased for all gases and the CO2/CH4 and H2/CH4 selectivities increased depending on the influence of the ZIF-12 filler. The maximum ideal separation factor for CO2/CH4 and H2/CH4 were found about 66.70 and 212.00, significantly higher than the pure polymer ideal separation factor.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Mehtap Safak Boroglu, Mehtap Ugur, Ismail Boz,