I.r. spectroscopic evidence for surface vibrational modes formed upon dehydroxylation of alumina

Abstract

Dehydroxylation of alumina at an activation temperature (T_ac) >673 K gives rise to a band in the 1020–1050 cm^–1 frequency range whose wavenumber and intensity increase with increasing T_ac and which is sensitive to ¹⁶O →¹⁸O exchange and disappears on adsorption of water or bases; it can be assigned to surface vibrational modes of alumina.