Adsorption properties of HKUST-1 toward hydrogen and other small molecules monitored by IR
| Autor: | Bo Xiao, Russell E. Morris, Elena Groppo, Paul S. Wheatley, Carlo Lamberti, Silvia Bordiga, Laura Regli, Francesca Bonino, A. Zecchina |
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| Rok vydání: | 2007 |
| Předmět: |
probe molecules
Hydrogen Spectrophotometry Infrared Nitrogen Surface Properties Analytical chemistry General Physics and Astronomy chemistry.chemical_element Infrared spectroscopy Photochemistry metal organic framework HKUST-1 hydrogen adsorption IR spectroscopy NO CO2 CO N2 H2 Nitric Oxide Sensitivity and Specificity Ion Adsorption Organometallic Compounds Physical and Theoretical Chemistry Temperature Microporous material Carbon Dioxide Small molecule Solvent chemistry Metal-organic framework Copper |
| Zdroj: | Physical chemistry chemical physics : PCCP. 9(21) |
| ISSN: | 1463-9076 |
| Popis: | 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, N2 and H2). From a temperature dependent IR study, it has been estimated that the H2 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 H2 species. |
| Databáze: | OpenAIRE |
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