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Infrared spectroscopic studies have shown that adsorbed carbon monoxide interacts with Bronsted acid Si(OH)A1 groups of the zeolite H-ZSM-5 forming hydrogen bonded H⋯CO and H⋯OC species, which were characterized by C-O stretching IR absorption bands at 2174 and 2120 cm-1, respectively. In the rubidium-exchanged zeolite, corresponding Rb+⋯CO and Rb+⋯OC adducts gave characteristic bands at 2161 and 2119 cm-1, respectively. Variable-temperature FTIR spectroscopy has shown that, in both cases, C- and O-bonded species are interrelated through a temperature dependent equilibrium in which the proportion of Obonded adducts increases with increasing temperature. By means of van't Hoff plots, the corresponding enthalpy change was found to be ΔH°= 4.6 kJ mol-1 for the CO/H-ZSM-5 system and ΔH°= 1.8 kJ mol-1 for CO/Rb-ZSM-5.
Original language | English |
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Pages (from-to) | 207-214 |
Number of pages | 8 |
Journal | Studies in Surface Science and Catalysis |
Volume | 142 A |
State | Published - 1 Dec 2002 |
ID: 41680792