Modeling adsorption equilibria of xylene isomers in a microporous metal-organic framework

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Barcia, PS (Author) Other; Nicolau, MPM (Author) Other; Gallegos, JM (Author) Other; Chen, BL (Author) Other; Alírio Rodrigues (Author) FEUP; Silva, JAC (Author) Other

Journal

Title: Microporous and Mesoporous Materials

Vol. 155

Pages: 220-226

ISSN: 1387-1811

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 6 Citations

Other information

Authenticus ID: P-002-9W8

DOI: 10.1016/j.micromeso.2012.01.033

Abstract (EN): Single and multicomponent adsorption equilibria of xylene isomers: o-xylene (o-x), m-xylene (m-x), p-xylene (p-x) and ethylbenzene (eb) was investigated on the three dimensional microporous metal-organic framework Zn(BDC)(Dabco)(0.5) (BDC = 1,4-benzenedicarboxylate, Dabco = 1.4-diazabicyclo[2.2.2]-octane), MOF 1, in the range of temperatures between 398 and 448 K and partial pressures up to 0.1 bar. The equilibrium data show that a significant amount (around 34 g/100g(ads) at 398 K) of xylene isomers can be adsorbed in MOF 1. The affinity to the adsorbent measured by the Henry's constants to decreases in the order o-x > m-x > eb > p-x for all temperatures. The zero coverage adsorption enthalpies are all similar and range from 77.4 (eb) to 79.8 kJ/mol (o-x). The Dual-Site Langmuir model (DSL) was used for the interpretation and correlation of the experimental data. The parameters obtained from the pure component isotherms fitting were also used to predict the multicomponent equilibrium data by an extended DSL model. A good agreement was obtained between the predictions and the experimental data. It was also demonstrated that the DSL model is also capable to explain the increase in the isosteric heat of sorption with increasing coverage.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7