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The infra-red spectra from 4000 to 750 cm–1 of various carbonato species adsorbed on magnesium oxide are presented. When CO2 is adsorbed at temperatures above 300°C a bidentate species is formed. The interaction on the MgO surface of CO2 with H2O and D2O results in the unidentate carbonate species when CO2 is adsorbed first but a bi-carbonate species HO—CO–2 is formed when water is adsorbed first. Correlations have been made of the low-frequency carbonate bands (1200–800 cm–1) and the carbonate bands in the region 1800–1200 cm–1. Infra-red absorption bands in the region 1200–800 cm–1, are better defined when D2O rather than H2O is used for the interaction studies.
Evans et al. (Sun,) studied this question.