Among microporous systems metal organic frameworks are considered promising materials for molecular adsorption. In this contribution infrared spectroscopy is successfully applied to highlight the positive role played by coordinatively unsaturated Cu2+ ions in HKUST-1, acting as specific interaction sites. A properly activated material, obtained after solvent removal, is characterized by a high fraction of coordinatively unsaturated Cu2+ ions acting as preferential adsorption sites that show specific activities towards some of the most common gaseous species (NO, CO2, CO, N-2 and H-2). From a temperature dependent IR study, it has been estimated that the H-2 adsorption energy is as high as 10 kJ mol(-1). A very complex spectral evolution has been observed upon lowering the temperature. A further peculiarity of this material is the fact that it promotes ortho-para conversion of the adsorbed H-2 species.

Adsorption properties of HKUST-1 toward hydrogen and other small molecules monitored by IR

BORDIGA, Silvia;REGLI, LAURA;BONINO, Francesca Carla;GROPPO, Elena Clara;LAMBERTI, Carlo;ZECCHINA, Adriano
2007

Abstract

Among microporous systems metal organic frameworks are considered promising materials for molecular adsorption. In this contribution infrared spectroscopy is successfully applied to highlight the positive role played by coordinatively unsaturated Cu2+ ions in HKUST-1, acting as specific interaction sites. A properly activated material, obtained after solvent removal, is characterized by a high fraction of coordinatively unsaturated Cu2+ ions acting as preferential adsorption sites that show specific activities towards some of the most common gaseous species (NO, CO2, CO, N-2 and H-2). From a temperature dependent IR study, it has been estimated that the H-2 adsorption energy is as high as 10 kJ mol(-1). A very complex spectral evolution has been observed upon lowering the temperature. A further peculiarity of this material is the fact that it promotes ortho-para conversion of the adsorbed H-2 species.
9(21)
2676
2685
http://www.rsc.org/publishing/journals/CP/article.asp?doi=b703643d
metal organic framework; HKUST-1; hydrogen adsorption; IR spectroscopy; probe molecules; NO; CO2; CO; N2; H2
S. BORDIGA; L. REGLI; F. BONINO; E. GROPPO; C. LAMBERTI; B. XIAO; P. S WHEATLEY; R.E. MORRIS, A. ZECCHINA
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/35109
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