Gas permeation properties of NaA zeolite membranes: effect of silica source on hydrogel synthesis and layer thickness
| Autor: | Anwu Li, John R. Grace, Robin J. White, Sung Su Kim, Ye Hwan Lee, Farzam Fotovat, Sang Moon Lee, Achim Schaadt, C. Jim Lim |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering 02 engineering and technology Permeance Permeation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Knudsen diffusion Membrane Chemical engineering Mechanics of Materials visual_art visual_art.visual_art_medium General Materials Science Thermal stability Ceramic Gas separation 0210 nano-technology Zeolite |
| Zdroj: | Journal of Porous Materials. 26:1121-1129 |
| ISSN: | 1573-4854 1380-2224 |
| DOI: | 10.1007/s10934-018-0707-z |
| Popis: | NaA zeolite membranes were prepared on the inner surfaces of ceramic α-alumina tubes based on an aqueous phase synthesis in order to investigate the influence of different silica sources on NaA zeolite membrane synthesis and zeolite layer thickness with reference to the gas separation properties. SEM and XRD results indicated that zeolite prepared with sodium metasilicate as the silica source can be synthesized for a NaA zeolite membrane, leading to uniform zeolite layers and good thermal stability. The H2 permeance at 25 °C was 4.99 × 10−7 mol m−2 s−1 Pa−1, and the H2/Ar and H2/He permselectivities were 3.78 and 1.36, respectively. The morphologies and single gas permeation properties of the NaA zeolite membranes prepared through repeated aqueous phase synthesis treatments were also studied. When the zeolite layer thickness increased from 2.9 to 53 µm, the H2 permeance gradually decreased, while the permselectivities increased from 3.78 to 5.17. The gas permeance was mainly controlled by the Knudsen diffusion in our NaA zeolite membrane. |
| Databáze: | OpenAIRE |
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