Effect of incorporating different ZIF-8 crystal sizes in the polymer of intrinsic microporosity, PIM-1, for CO2/CH4 separation
| Autor: | Ahmad Rahimpour, M. Essalhi, Quynh Nhu Phan Le, Norafiqah Ismail, Ola Sundman, Mohamed Yahia, Naser Tavajohi, Mauro M. Dal-Cin |
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| Rok vydání: | 2021 |
| Předmět: |
Solid-state chemistry
Materials science Materialkemi 02 engineering and technology 010402 general chemistry 01 natural sciences Membrane technology Crystal Mixed matrix membranes Kemiska processer Polymerkemi Materials Chemistry PIM-1 General Materials Science Polymer Technologies Annan kemiteknik chemistry.chemical_classification Other Chemical Engineering Separation of carbon dioxide and methane Sorption General Chemistry Polymer Polymer Chemistry Polymerteknologi 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Membrane Chemical engineering chemistry Mechanics of Materials Chemical Process Engineering Barrer Polymers of intrinsic microporosity 0210 nano-technology Selectivity ZIF-8 |
| Zdroj: | Microporous and Mesoporous Materials. 312:110761 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2020.110761 |
| Popis: | Effective and economical carbon dioxide-methane separation (CO2/CH4) is highly desirable in several industries such as sweetening natural gases and renewable natural gas (RNG) from biogas and landfills. Among the different separation technologies, membrane separation has been shown to have lower cost of production and lower CH4 losses. In this study, Zeolitic Imidazole Frameworks (ZIF-8) crystals with sizes varying from 45 nm to 450 nm were synthesized and incorporated in the polymer of intrinsic microporosity, PIM-1, to form mixed matrix membranes (MMMs). The structure, morphology, and physicochemical properties of the MMMs were characterized by 1H NMR, FTIR, XRD, TGA, and SEM. ZIF-8 crystal size was controlled using the concentration of sodium formate. The influence of the ZIF-8 crystal size on MMMs was studied by sorption, gas permeability, and aging of the membranes. The MMMs with ZIF-8 crystals of 120 nm particle diameter yielded the greatest improvement in gas transport properties; the CO2/CH4 selectivity-CO2 permeability was 11.4 and 9700 Barrer compared to PIM-1 with 6.4 and 9300 Barrer respectively. The former is near the Robeson 2008 upper bound, while PIM-1 is on the 1991 upper bound. After 40 days of aging, selectivity increased and permeability decreased; the changes were parallel to the Robeson upper bounds indicating increased polymer packing and diffusivity selectivity. |
| Databáze: | OpenAIRE |
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