Variable temperature FTIR spectroscopy of carbon monoxide adsorbed on protonic and rubidium-exchanged ZSM-5 zeolites
作者： C Otero Areán , M Peñarroya Mentruit , M Rodríguez Delgado , G Turnes Palomino , OV Manoilova
DOI: 10.1016/S0167-2991(02)80030-1
关键词: ZSM-5 、 Physical chemistry 、 Hydrogen 、 Fourier transform infrared spectroscopy 、 Carbon monoxide 、 Zeolite 、 Enthalpy 、 Inorganic chemistry 、 Chemistry 、 Rubidium 、 Adsorption
摘要: Infrared spectroscopic studies have shown that adsorbed carbon monoxide interacts with Bronsted acid Si(OH)Al groups of the zeolite H-ZSM-5 forming hydrogen bonded H… CO and OC species, which were characterized by C−O stretching IR absorption bands at 2174 2120 cm −1 , respectively. In rubidium-exchanged zeolite, corresponding Rb + … adducts gave characteristic 2161 2119 Variable-temperature FTIR spectroscopy has that, in both cases, C-and O-bonded species are interrelated through a temperature dependent equilibrium proportion increases increasing temperature. By means van't Hoff plots, enthalpy change was found to be ΔH o =4.6 kJ mol for CO/H-ZSM-5 system =1.8 CO/Rb-ZSM-5.
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