Boehmite-phenolic resin carbon molecular sieve membranes—Permeation and adsorption studies |
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Authors: | Miguel Teixeira Sandra C Rodrigues Marta Campo David A Pacheco Tanaka Margot A Llosa Tanco Luís M Madeira José M Sousa Adélio Mendes |
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Affiliation: | 1. LEPABE – Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Presently at Tecnalia, Parque Tecnológico de San Sebastián – Paseo Mikeletegi, 2. E-20009 Donostia, San Sebastián, Spain;3. Escola da Vida e das Ciências Ambientais, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal |
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Abstract: | Composite carbon molecular sieve membranes (c-CMSM) were prepared in a single dipping–drying–carbonization step from phenolic resin solutions (12.5–15 wt.%) loaded with boehmite nanoparticles (0.5–1.2 wt.%). A carbon matrix with well-dispersed Al2O3 nanowires was formed from the decomposition of the resin and dehydroxylation of boehmite. The effect of the carbon/Al2O3 ratio on the porous structure of the c-CMSM was accessed based on the pore size distribution and gas permeation toward N2, O2, CO2, He, H2, C3H6 and C3H8. c-CMSM with higher carbon/Al2O3 ratios had a more open porous structure, exhibiting higher permeabilities and lower permselectivities. c-CMSM performance was above the upper bound curves for polymeric membranes for several gas pairs, particularly for C3H6/C3H8 (permeability toward C3H6 of 420 barrer and permselectivity of 18.1 for a c-CMSM with carbon/Al2O3 ratio of 4.4). |
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Keywords: | Composite membrane Boehmite nanoparticles Olefin purification Phenolic resin Gas separation Carbon |
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