Abstract
Ozone adsorption on CaO pretreated at different temperatures was studied by FTIR spectroscopy at 77−300 K. Besides physisorption effects, a weak complex was observed formed by ozone molecules with the OH surface groups, which have pronounced basic properties, as shown by a downward shift of the νOH band by about 21 cm-1 and by slight changes in ozone vibrational frequencies. Chemisorption of O3 occurred on CaO activated at 973 K as evidenced by the appearance of a band at 812 cm-1 accompanied by two weaker peaks at 1859 and 625 cm-1 attributed to the ν3, ν1 + ν3, and ν2 vibrational modes, respectively, of the surface ozonide O3- ions. Experiments with 18O substitution supported this assignment. Effect of CO preadsorption showed ozone chemisorption to occur on the same coordinate-unsaturated O2- surface sites that accounted for the formation of the “carbonite” CO22- ion from CO adsorbed on highly activated CaO.
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