Abstract
The effect of adsorption of acid gases CO2, SO2 and SO3 on the electron-accepting ability of cations at the surface of calcium oxide was studied by low-temperature IR spectroscopy of adsorbed CO. It is shown that the formation of carbonate, sulfite and sulfate anions in the surface layer leads to the appearance of Lewis acid sites, the strength of which, estimated by the shift in the vibrational frequency of CO molecules bound to them, increases in the corresponding order, approaching that for calcium- containing zeolites. The results of calculation of cluster models by the DFT method confirm the observed trends in the variation of vibrational frequency and the absorption coefficient of CO molecules bound both via carbon atom or via oxygen, and also demonstrate the dependence of the ability of a cation to linkage isomerism on its local environment.
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