Design and preparation of high permeability porous mullite support for membranes by in-situ reaction |
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| Affiliation: | 1. School of Material Science and Chemical Engineering, Chuzhou University, 239000, PR China;2. State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing University of Technology, PR China;3. The Seawater Desalination and Utilization of the Alternative Water Resources, Research Center of Hohai University, Hohai University Nanjing 210009, PR China;1. Ceramics Laboratory, Physics Department, Constantine University 1, Constantine 25000, Algeria;2. Physics Department, Jijel University 1, Jijel 18000, Algeria;1. CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China;2. Ningbo Urban Environment Observation and Research Station—NUEORS, Chinese Academy of Sciences, PR China;3. Materials and Surface Science Institute (MSSI), University of Limerick (UL), Limerick, Ireland;4. Institut Europeen des Membranes, UMR 5635, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France;5. Inorganic Membranes, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands;1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024 PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001 PR China;1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, School of Materials Science and Engineering, Qilu University of Technology, Jinan, Shandong 250353, PR China;2. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, PR China;3. Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, PR China;1. High Temperature Ceramics Institute, Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450052, China;2. College of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, China;1. CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, PR China;2. Ningbo Urban Environment Observation and Research Station-NUEORS, Chinese Academy of Sciences, PR China;3. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, PR China;4. Institut Europeen des Membranes UMR 5635, Place Eugene Bataillon, 34095 Montpellier, Cedex 5, France;5. Materials and Surface Science Institute (MSSI), University of Limerick (UL), Ireland |
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| Abstract: | The natural mineral kaolin combined with alumina additives Al(OH)3,α-Al2O3 and AlF3 was used to prepare porous mullite ceramic membrane supports using an in-situ reaction. The effects of composition and sintering temperature on the sintering behavior, pore structure, permeability and microstructure of the resulting porous mullite supports were extensively investigated. The experimental results showed that excess SiO2 in kaolin can be consumed by adding alumina precursors, which resulted in a stiff skeleton of interlinked needle-like mullite crystals in-situ during the sintering. The needle-like mullite crystals touched each other and formed a short network, which acted as a porous skeletal network structure. This network resulted in a highly permeable porous structure. The resulting support is suitable for the preparation of asymmetric ceramic membranes. The densification and pore structure of the support can be effectively adjusted by control of the quantity of alumina precursors in the composition and the sintering temperature. Sintering the subject mullite compositions at 1500 °C for two hours resulted in support structures with an average porosity of 45.9%, an average pore size of 1.3 µm and a penetrating porosity of 35.9%. |
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| Keywords: | Support Ceramic membrane High permeability in-situ reaction |
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