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Effect of MFI zeolite intermediate layers on gas separation performance of carbon molecular sieve (CMS) membranes
- Wey, Ming-Yen, Tseng, Hui-Hsin, Chiang, Chian-kai
- Journal of membrane science 2013 v.446 pp. 220-229
- adhesion, artificial membranes, carbon, crystallites, hydrogen, methane, permeability, silica, zeolites
- To strengthen interfacial adhesion between selective carbon molecular sieve (CMS) layers and α-Al₂O₃ substrates, mordenite framework inverted (MFI)-type intermediate layers were synthesized to reduce pore sizes and improve chemical characteristics of underlying substrates and consequently facilitate formation of CMS layers. MFI-type zeolite intermediate layers were prepared on α-Al₂O₃ substrates via secondary growth of seeds to form polycrystalline zeolite layers with a-oriented crystallites. These crystallites increased cross-link strength between separation layers as well as gas pair separation performance. When a porous substrate was treated with silica seeds and covered with an MFI intermediate layer, CMS selectivity for H₂/CH₄ increased to 260.9 with permeability towards H₂ of 2224Barrer. These modifications improved the mechanical stability of CMS layers and will assist in their commercialization.