Toward Understanding the Influence of Ethylbenzene in p-Xylene Selectivity of the Porous Titanium Amino Terephthalate MIL-125(Ti): Adsorption Equilibrium and Separation of Xylene Isomers

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

Authors

Mariana A. Moreira (Author) Other; João C. Santos (Author) Other; Alexandre F. P. Ferreira (Author) FEUP; José M. Loureiro (Author) FEUP; Florence Ragon (Author) Other; Patricia Horcajada (Author) Other; Pascal G. Yot (Author) Other; Christian Serre (Author) Other; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Langmuir

Vol. 28 No. 7

Pages: 3494-3502

ISSN: 0743-7463

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 32 Citations

Scopus - 42 Citations

Associated Projects

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

Other information

Authenticus ID: P-002-CZ9

DOI: 10.1021/la204969t

Abstract (EN): The potential of the porous crystalline titanium dicarboxylate MIL-125(Ti) in powder form was studied for the separation in liquid phase of xylene isomers and ethylbenzene (MIL stands for Materials from Institut Lavoisier). We report here a detailed experimental study consisting of binary and multi-component adsorption equilibrium of xylene isomers in MIL-125(TO powder at low (<= 0.8 M) and bulk (>= 0.8 M) concentrations. A series of multi-component breakthrough experiments was first performed using n-heptane as the eluent at 313 K, and the obtained selectivities were compared, followed by binary breakthrough experiments to determine the adsorption isotherms at 313 K, using n-heptane as the eluent. MIL-125(Ti) is a para-selective material suitable at low concentrations to separate p-xylene from the other xylene isomers. Pulse experiments indicate a separation factor of 1.3 for p-xylene over o-xylene and m-xylene, while breakthrough experiments using a diluted ternary mixture lead to selectivity values of 1.5 and 1.6 for p-xylene over m-xylene and o-xylene, respectively. Introduction of ethylbenzene in the mixture results however in a decrease of the selectivity.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9