Influence of the intermediate layer on the hydrothermal stability of sol-gel derived hybrid silica membranes |
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| Affiliation: | 1. Department of Materials Science and Engineering, Tarbiat Modares University, Tehran, PO Box 14115-143, Iran;2. Materials Program, Arizona State University, Tempe, Arizona 85287-6106, USA;3. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Materials Science and Engineering, The University of New South Wales, Sydney 2052, Australia;1. CEA/DEN/DTN/SMTA/LIPC, Site de Cadarache, 13108 St-Paul lez Durance, France;2. ICSM, UMR 5257, CEA, CNRS, ENSCM, Univ. Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols/Cèze, France;1. Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26550 Eskisehir, Turkey;2. Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany;3. Science Consulting International, Niersteinerstr. 1, 70499 Stuttgart, Germany;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;3. Department of Mechanical Engineering, University of Kentucky, Lexington, 40506, USA |
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| Abstract: | The hydrothermal stability of microporous silica hybrid sol-gel derived membranes is often only tested for either the mesoporous intermediate membrane layer or the microporous separation layer. In this work an investigation is done on the interaction between the intermediate γ-alumina layer and the hybrid (BTESE-derived) silica separation layer during hydrothermal treatment. Although bare γ-alumina is degraded during a hydrothermal treatment, a coating of hydrophobic BTESE on γ-alumina retains its gas separation performance, albeit with a lower mechanical adhesion between the hybrid silica separation layer and the γ-alumina intermediate layer. Applying a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer stabilizes the γ-alumina membrane. A BTESE coating on a MAP modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a significant increase in the H2/N2 (perm)selectivity, factor 3, was observed for these membranes. |
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| Keywords: | Hydrothermal stability Hybrid silica Gas separation Microporous membrane Monoaluminumphosphate coating |
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