Improved AlPO-18 membranes for light gas separation
Abstract
High-quality AlPO-18 membranes were synthesized using low-cost symmetric alumina supports by a single hydrothermal step, and showed to be useful for light gas separation. Single-gas permeances of CO2, N2, CH4 and C3H8 decreased with increasing kinetic diameter. Single CO2 and CH4 permeance dependence of pressure drop was predicted by the Maxwell–Stefan diffusion model and was in agreement with experimental data. The best AlPO-18 membrane showed smaller-component permeances of 6.5, 6.3 and 1.0 × 10−7 mol (m2 s Pa)−1 (equal to 1940, 1880 and 300 GPU) and mixture selectivities of 220, 45 and 22 for equimolar CO2/CH4, CO2/N2 and H2/CH4 binary mixtures at room temperature and 0.2 MPa pressure drop, respectively. The effects of temperature and pressure on the membrane's separation performance in the three binary mixtures were discussed.
- This article is part of the themed collection: 2015 Journal of Materials Chemistry A Hot Papers
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