Abstract
CO interacts with extra‐framework alkali metal cations (M+=) of zeolites to form both M+⋯CO and M+⋯OC species. By using variable‐temperature FTIR spectroscopy, these C‐bonded and O‐bonded species were found to be in a temperature‐dependent equilibrium. For the same cation, the difference in interaction energy depends upon the zeolite framework. Thus, for the equilibrium process ZNa+⋯=CO ⇌ ZNa+⋯OC, where Z represents the zeolite framework, ΔH 0 was found to take the values 3.8 and 2.4 kJ mol− for CO/Na‐ZSM‐5 and CO/Na‐Y, respectively. The C‐bonded species show always the highest cation–CO interaction energy.
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Tsyganenko, A., Escalona Platero, E., Otero Areán, C. et al. Variable‐temperature IR spectroscopic studies of CO adsorbed on Na‐ZSM‐5 and Na‐Y zeolites. Catalysis Letters 61, 187–192 (1999). https://doi.org/10.1023/A:1019089309446
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DOI: https://doi.org/10.1023/A:1019089309446