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

被引：257

作者：

Barcia, Patrick S. ^{[1
,2
]}

Guimaraes, Daniela ^{[2
]}

Mendes, Patricia A. P. ^{[2
]}

Silva, Jose A. C. ^{[2
]}

Guillerm, Vincent ^{[3
]}

Chevreau, Hubert ^{[3
]}

Serre, Christian ^{[3
]}

Rodrigues, Alirio E. ^{[1
]}

机构：

[1] Univ Porto, Lab Separat & React Engn, Dept Engn Quim, Fac Engn, P-4200465 Oporto, Portugal

[2] Escola Super Tecnol & Gestao, Inst Politecn Braganca, P-5301857 Braganca, Portugal

[3] Univ Versailles St Quentin en Yvelines, Inst Lavoisier, CNRS, UMR 8180, F-78035 Versailles, France

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2011年 / 139卷 / 1-3期

关键词：

Adsorption; Fixed-bed; Vapor mixture; Reverse shape selectivity; Metal-organic framework; METAL-ORGANIC FRAMEWORK; ZEOLITE-BETA; SEPARATION; SORPTION; ENTROPY; PELLETS; DESIGN;

D O I：

10.1016/j.micromeso.2010.10.019

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

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. (c) 2010 Elsevier Inc. All rights reserved.

引用

页码：67 / 73

页数：7

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