Evolution of pore size distribution and average pore size of porous ceramic membranes during modification by counter-diffusion chemical vapor deposition |
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| Institution: | 1. Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;2. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;3. Separation and Conversion Materials Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Daejeon 34129, Republic of Korea;1. Department of Energy Conversion and Storage, Technical University of Denmark, Risø campus, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;2. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;1. Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria;2. Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachiouji, Tokyo 192-0397, Japan;1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, 69 Hongguang Rd, Lijiatuo, Banan District, Chongqing 400054, PR China;2. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, PR China;3. School of Energy Research, Xiamen University, Xiamen 361005, PR China;4. Plasma Nanoscience Center Australia (PNCA), Manufacturing Flagship, Commonwealth Scientific and Industrial Research Organization, PO Box 218, Lindfield 2070, NSW, Australia;5. Institute for Future Environments and School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane 4000, QLD, Australia;6. Plasma Nanoscience, School of Physics, The University of Sydney, Sydney 2006, NSW, Australia |
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| Abstract: | The modification of porous ceramic membranes by counter-diffusion chemical vapor deposition (CVD) is studied theoretically and experimentally. Numerical simulations of the evolution of the membrane permeance, average pore size and pore size distribution as a function of extent of modification are presented and compared with experimetal data. It is found that the change of the average pore size of the membranes after modification strongly depends on the initial pore size distribution of the membrane, CVD reaction kinetics and characterization method. Experimental data suggest that CVD of zirconia (and yttria) inside porous ceramic membranes by reaction of zirconium (and yttrium) chlorides with steam/air at elevated temperatures proceeds by quasi-zero reaction kinetics with respect to the oxidant, typical of non-stoichiometric supply of the reactants from opposite sides of the membrane. Under such conditions, CVD modification may result in a modest increase of the average pore size of coarse-pore ceramic membranes as suggested by numerical calculations and experimental data. |
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