Reverse Shape Sellectivity in the Liquid-Phase Adsorption of Xylene Isomers in Zirconium Terephthalate MOF UiO-66

被引：108

作者：

Moreira, Mariana A. ^{[1
]}

Santos, Joao C. ^{[1
]}

Ferreira, Alexandre F. P. ^{[1
]}

Loureiro, Jose M. ^{[1
]}

Ragon, Florence ^{[2
]}

Horcajada, Patricia ^{[2
]}

Shim, Kyu-E. ^{[3
]}

Hwang, Young-K. ^{[3
]}

Lee, U. -Hwang ^{[3
]}

Chang, Jong-S. ^{[3
]}

Serre, Christian ^{[2
]}

Rodrigues, Alirio E. ^{[1
]}

机构：

[1] Univ Porto, Fac Engn, Associate Lab LSRE LCM, LSRE, P-4200465 Oporto, Portugal

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

[3] KRICT, Catalysis Ctr Mol Engn, Taejon 305600, South Korea

来源：

LANGMUIR | 2012年 / 28卷 / 13期

基金：

新加坡国家研究基金会;

关键词：

METAL-ORGANIC FRAMEWORKS; SELECTIVE ADSORPTION; SEPARATION; ETHYLBENZENE; EQUILIBRIUM; ZEOLITE; KINETICS;

D O I：

10.1021/la3004118

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Powder, agglomerates, and tablets of the microporous zirconium(IV) terephthalate metal-organic framework UiO-66 were evaluated for the selective adsorption and separation of xylene isomers in the liquid phase using n-heptane as the eluent. Pulse experiments, performed at 313 K in the presence of n-heptane, revealed the o-xylene preference of this material, which was further confirmed by binary and multicomponent breakthrough experiments in the presence of m- and p-xylene, resulting in selectivities at 313 K of 1.8 and 2.4 with regards to m-xylene and p-xylene, respectively. Additionally, because p-xylene is the less retained isomer, UiO-66 presents a selectivity pattern that is reverse of that of the xylenes molecular dimension with respect to shape selectivity. The shaping of the material as tablets did not significantly change its selectivity toward the o-xylene isomer or toward p-xylene, which was the less retained isomer, despite a loss in capacity. Finally, the selectivity behavior of UiO-66 in the liquid n-heptane phase makes it a suitable material for o-xylene separation in the extract (heavy product) or p-xylene separation in the raffinate (light product) by simulated moving bed technology.

引用

页码：5715 / 5723

页数：9

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