Abstract
Publisher Summary This chapter presents variable-temperature Fourier transform infrared spectroscopy (FTIR) study of the equilibrium between C-bonded and O-bonded carbon monoxide in H-ZSM-5. 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 H···OC species, which are characterized by C–O stretching infrared (IR) absorption bands at 2175 and 2112 cm -l , respectively. By means of variable-temperature FTIR spectroscopy, these C-bonded and O-bonded adducts are found to be in a temperature dependent equilibrium, which can be described as ZH···CO ⇄ ZH···OC, where Z stands for the zeolite framework. The corresponding enthalpy change is found to be ΔH°= 4.2 kJ mol -1 , as derived from a van't Hoff analysis of the intensity of the corresponding IR absorption bands as a function of temperature.
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