Interaction of the CO molecule with Li+ within ZSM-5 was investigated by means of the combined quantum mechanics/interaction potential function method. Both, C-on and O-on species were considered. The scaling method based on the linear correlation between CO bond length and stretching frequency has been applied to calculate CO frequencies in CO(OC)–Li+/ZSM-5 adsorption complexes. Three types of C-on adsorption complexes with different r(CO) bond lengths, ν(CO) frequencies, and CO binding energies were identified. The calculated IR spectra of CO adsorbed on the Li+/ZSM-5 system show three distinctive bands at about 2194 cm−1, 2187 cm−1 and 2183 cm−1 for C-on complexes and at about 2116 cm−1, 2114 cm−1 and 2104 cm−1 for O-on complexes, in excellent agreement with experimental data. Calculated adsorption energies and CO stretching frequencies were used for the simulation of the IR spectra at various CO coverages.
You have access to this article
Please wait while we load your content...
Something went wrong. Try again?