Adsorption of pyridine onto the metal organic framework MIL-101

Mi Jin Kim; Se Min Park; Sun-Jung Song; Jiyeon Won; Jin Yong Lee; Minyoung Yoon; Kimoon Kim; Gon Seo

doi:10.1016/j.jcis.2011.05.067

Adsorption of pyridine onto the metal organic framework MIL-101

J Colloid Interface Sci. 2011 Sep 15;361(2):612-7. doi: 10.1016/j.jcis.2011.05.067. Epub 2011 Jun 12.

Authors

Mi Jin Kim¹, Se Min Park, Sun-Jung Song, Jiyeon Won, Jin Yong Lee, Minyoung Yoon, Kimoon Kim, Gon Seo

Affiliation

¹ School of Applied Chemical Engineering and The Research Institute for Catalysis, Chonnam National University, Yongbong-Dong, Buk-Gu, Gwangju 500-757, Republic of Korea.

PMID: 21700293
DOI: 10.1016/j.jcis.2011.05.067

Abstract

The adsorption of pyridine onto the metal organic framework MIL-101 was investigated by experimental and theoretical methods. The amount of pyridine adsorbed on MIL-101 was extraordinarily large at 20 °C, corresponding to about 950 mg/g of dried MIL-101 and approximately half of the voids being filled. Most of the pyridine that had filled the voids was rapidly removed by evacuation at room temperature, but some of the pyridine was so strongly adsorbed that it was retained even under evacuation at 150 °C. Although IR spectra of the adsorbed pyridine indicated the adsorption of pyridine as pyridinium ions and coordinated pyridine at low temperatures, increasing the adsorption temperature induced partial cleavage of the pyridine rings. The high stabilization energy of pyridine on the coordinative unsaturated sites (CUS) of MIL-101, obtained by theoretical calculation, -103 kJ/mol, supported the strong adsorption of pyridine on the CUS.