Structure,stability and permeation properties of NaA zeolite membranes for H2O/H2 and CH3OH/H2 separations |
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| Authors: | Sang Moon Lee Nong Xu John R Grace Anwu Li C Jim Lim Sung Su Kim Farzam Fotovat Achim Schaadt Robin J White |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, V6T 1Z3, Canada;2. NORAM Engineering and Constructors Ltd., Suite 1800-200, Granville St, Vancouver, BC, V6C 1S4, Canada;3. Department of Environmental Energy Engineering, Kyonggi University, 94 San, Iui-dong, Youngtong-gu, Suwon-si, Gyeonggi-do, 442-760, Republic of Korea;4. Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstraße 2, 79110 Freiburg, Germany;5. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Canada |
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| Abstract: | NaA zeolite membranes were synthesised in the secondary growth hydrothermal method based on the seeding of the inner surface of a ceramic α-alumina tube. The impacts of crystallisation time and zeolite precursor concentration (in H2O) were investigated. The structure and stability of the prepared NaA zeolite membranes were also investigated with operating temperatures, times and pressures. The results indicate that the optimal synthesis gel molar composition was 3Na2O: 2SiO2: Al2O3: 200H2O. This led to cubic-shaped NaA zeolite which showed good stability. The optimal NaA zeolite membrane had H2O and CH3OH fluxes of 2.77 and 0.19 kg/m2h, with H2O/H2 and CH3OH/H2 separation factors of ∞ and 0.09 at a temperature of 30 °C. The NaA zeolite membrane had high thermal stability, but poor separation performance at high temperature (240 °C). The results suggested that the H2 permeation flux is significantly influenced by preferential adsorption of vapour in the NaA zeolite membrane. |
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| Keywords: | NaA zeolite Membrane Structure Stability Separation factor Sodalite |
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