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Advisor(s)
Abstract(s)
An adsorption study of hexane and xylene isomers mixtures was addressed in a rigid zirconium terephthalate UiO-66 (UiO for University of Oslo) with octahedral and tetrahedral cavities of free diameter
close to 1.1 nm and 0.8 nm, respectively. Multicomponent equimolar breakthrough experiments show that the adsorption hierarchy of structural isomers in UiO-66 is opposite to the one observed in conventional
adsorbents. For hexane isomers, it was found that the amount adsorbed increases with the degree of branching, being 2,2-dimethylbutane (22DMB) and 2,3-dimethylbutane (23DMB) the more retained
molecules. Regarding the xylene isomers, the results show that the adsorption of the bulkier ortho-xylene(oX) is favoured compared to its homologues. The structural similarity between MOF UiO-66 and zeolite
MCM-22 suggests that the reverse shape selectivity observed in the adsorption of hexane and xylene isomers might be attributed to the rotational freedom of the molecules inside the small cavities.
Description
Keywords
MOFs Hexane isomers Adsorption
Citation
Silva, José A.C.; Rodrigues, Alírio; Bárcia, Patrick da Silva; Guimarães, Daniela; Mendes, Patricia; Chevreau, Hubert; Serre, Christian; Guillerm, Vincent (2011). Reverse shape selectivity in the adsorption of hexane and xylene isomers in MOF UiO-66. Microporous and Mesoporous Materials. ISSN 1387-1811. 139:1-3, p. 67-73
Publisher
Elsevier