Characterization of Carbon Molecular Sieve Membranes Supported on Ceramic Tubes
| Autor: | K. Briceño, J. Silvestre-Albero, A. Silvestre-Albero, J.I. Calvo, D. Montane, R. García-Valls, A. Hernández, F. Rodríguez-Reinoso |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Adsorption Science & Technology, Vol 31 (2013) |
| Druh dokumentu: | article |
| ISSN: | 0263-6174 2048-4038 |
| DOI: | 10.1260/0263-6174.31.2-3.233 |
| Popis: | Carbon molecular sieve membranes have been analyzed in supported and unsupported configurations in this experimental study. The membranes were used to adsorb CO 2 , N 2 and CH 4 , and their adsorption data were analyzed to establish differences in rate and capacity of adsorption between the two types of samples (supported and unsupported). Experimental results show an important effect of the support, which can be considered as an additional parameter to tailor pore size on these carbon membranes. Immersion calorimetry values were measured by immersing the membranes into liquids of different molecular dimensions (dichloromethane, benzene, n-hexane, 2,2-dimethylbutane). Similarities were found between adsorption and calorimetric analysis. The pore volume of the samples analyzed ranged from 0.016 to 0.263 cm 3 /g. The effect of the pyrolysis temperature, either 550 or 700 °C, under N 2 atmosphere was also analyzed. Quantification of the pore-size distribution of the support was done by liquid–liquid displacement porosimetry. The composite membrane was used for CO 2 /CH 4 separation before and after pore plugging was done. The ideal selectivity factors value (4.47) was over the Knudsen theoretical factor (0.60) for membrane pyrolyzed at 600 °C, which indicates the potential application of these membranes for the separation of low-molecular weight gases. |
| Databáze: | Directory of Open Access Journals |
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