277058 Reverse Shape Selectivity in Liquid Phase Adsorption of Xylene Isomers in the Zirconium Terephthalate MOF Uio-66
Reverse shape selectivity in liquid phase adsorption of xylene isomers in the zirconium terephthalate MOF UiO-66
Mariana A. Moreira†, João C. Santos†, Alexandre F. P. Ferreira†, José M. Loureiro†, Florence Ragon‡, Patricia Horcajada‡, Kyu.-E. Shim§, Young- K. Hwang§, U.- Hwang Lee§, Jong.-S. Chang§, Christian Serre‡, Alírio E. Rodrigues†*
† LSRE - Laboratory of Separation and Reaction Engineering - Associate Laboratory LSRE/LCM, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; ‡ Institut Lavoisier (UMR CNRS 8180), Université de Versailles Saint-Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles cedex, France; § Catalysis Center for Molecular Engineering, Korea Research Institute of Chemical Technology (KRICT), P.O. Box 107, Yusung, Taejon 305–600, Korea.
Powder, agglomerates and tablets of the microporous zirconium (IV) terephthalate Metal-organic framework UiO-66 were evaluated for selective adsorption and separation of xylene isomers and ethylbenzene in liquid phase using n-heptane as eluent. Pulse experiments, performed at 313 K in presence of n-heptane, revealed the o-xylene preference of this material, further confirmed by binary and multi-component breakthrough experiments in the presence of m-, p-xylene, and ethylbenzene. The shaping of the material as tablets did not significantly change its selectivity towards the o-xylene isomer despite a loss in capacity. The binary and multicomponent equilibrium data of the xylene isomers and ethylbenzene was well modeled by a Dual Langmuir model. The simulations of the breakthrough and reverse breakthrough experiments were performed in the three materials, presenting good agreement between the simulation and experimental results.