Preparation and characterization of porous MgAl2O4 spinel ceramic supports from bauxite and magnesite |
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| Affiliation: | 1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran;2. Department of Materials Science and Engineering, Malek Ashtar University of Technology, Isfahan, Iran;1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;2. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;2. Department of Materials Science and Engineering, University of Ioannina, GR-451 10, Ioannina, Greece;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. Materials and Surface Science Institute (MSSI), University of Limerick (UL), Ireland |
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| Abstract: | Porous magnesium aluminate spinel (MgAl2O4) ceramic supports were fabricated by reactive sintering from low-cost bauxite and magnesite at different temperatures ranging from 1100 to 1400 °C and their sintering behavior and phase evolution were evaluated. The effects of sintering temperature on the pore structure, size and distribution as well as on the main properties of spinel ceramic supports such as flexural strength, nitrogen permeation flux and chemical resistance were investigated. The supports prepared at 1300 °C showed a homogeneous pore structure with the average pore size of 4.42 μm, and exhibited high flexural strength (35.6 MPa), high gas permeability (with nitrogen gas flux of 3057 m3 m?2 h?1 under a trans-membrane pressure of 0.1 MPa) and excellent chemical resistance. |
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| Keywords: | Sintering Spinel ceramic support Bauxite Magnesite |
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