Reverse shape selectivity in the adsorption of hexane and xylene isomers in MOF UiO-66

Autor:	Patricia A. P. Mendes, Daniela Guimarães, Hubert Chevreau, José A.C. Silva, Alírio E. Rodrigues, Vincent Guillerm, Patrick da Silva Bárcia, Christian Serre
Rok vydání:	2011
Předmět:	Hexane isomers Chemistry Xylene General Chemistry Condensed Matter Physics Molecular sieve MOFs Hexane chemistry.chemical_compound Adsorption Mechanics of Materials Structural isomer Molecule Physical chemistry Organic chemistry General Materials Science Selectivity Zeolite
Zdroj:	Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP
ISSN:	1387-1811
DOI:	10.1016/j.micromeso.2010.10.019
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::112a4d6066232fa69d03791072f5828d https://doi.org/10.1016/j.micromeso.2010.10.019 Zobrazit plný text záznamu Full Text from ScienceDirect