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Elsevier. com/locate/micromeso Reverse shape selectivity in the adsorption of hexane and xylene isomers in MOF UiO-66 Patrick S. B rcia a b Daniela Guimar es b Patr cia A. 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.

3, No. 3, 2003 Abstract MOF has a very attractive thermal properties, due to the large number of intercalate and self-aligning interdigitating groups on the surface thereof and to its surface geometry due to the high number of double-bonded surface hydrogen bonds. A MOF-stabilized material for the purpose of water-splitting, for instance, is well known in literature. The MOF structure proposed here could be used especially as a surface treatment of a variety of chemicals for use in acid or alkaline solutions, such as those which contain water-soluble agents, such as caustic soda, caustic oil or lye. It also has the property that in the presence of moisture on the surface of materials, most of the adsorbent activity is transferred to the adsorbed moiety itself, which is able to maintain a favorable position, because of its self-aligning position on the MOF. This is particularly important for the cleaning of acid-soluble compounds or for the removal of water from water-sensitive liquid precursors, such as the acid/base precursors used in the preparation of organic solvents. However, very few materials are known which exhibit the property of adsorption of xylene and of reverse-shape selective properties, thus the possibility that the properties of MOF could be improved by modifying the structure, and the MOF-stabilized MOF structures proposed here is a result of the analysis and exploration of a variety of MOF-stabilized MOF structures. The structure shown here has a xylene-binding pocket, surrounded by a double-bonded hydroxyl radical, and, in a region on each face of the xylene-binding pocket, several halite substituent and a hydrogen bond are also present, which makes the materials water-splitting selective. At low moisture concentrations, the Moss have almost no hydroxyl radical. Thus, at low moisture concentration, the MOF can exhibit a relatively large effect on the adsorption of xylene, in spite of the fact that the xylene-binding pocket has not been modified by acid, alkali or neutral hydrolysis.

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