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Infrared Study Of CO2 Adsorption On ZnO. Adsorption Sites
Published 1982 · Chemistry
Adsorption of carbon dioxide on a ZnO Kadox-15 powder has been studied by Fourier transform infrared spectroscopy. The following surface species are formed: bidentate carbonates, polydentate carbonates which appear with time or heating, hydrogenocarbonates and linear CO2 species. Moreover, a band at 1546 cm–1 could correspond to carboxylates reversibly adsorbed at room temperature. Attention is paid to the effect of CO2 addition which splits the νa(OCO) and δ(CO2) bands due to linear species and shifts the bidentate carbonates band from 1595 to 1615 cm–1. Taking account of the band va(O13CO)(in natural abundance), we deduce that the splitting is due to a coupling between two linear species held by the same Zn2+ ion. We propose that such Zn2+ ions that are two-fold coordinate are situated on the edges formed by the (0001)(10text-decoration:overline10) planes.