INFRARED SPECTRA OF CARBON MONOXIDE AND CARBON DIOXIDE ADSORBED ON CHROMIA–ALUMINA AND ON ALUMINA

Abstract

Infrared spectra of CO and CO2 adsorbed on chromia–alumina and on alumina surfaces have been determined. A band near 2200 cm−1 formed by CO on both surfaces at room temperature was due to a weak, non-activated sorption, but also contained a contribution from a more strongly sorbed, activated species on the chromia–alumina. The assignment of this band was discussed in some detail. Bands in the region 1200–1800 cm−1 were considered in terms of surface CO2− species, although in certain instances the appearance of bands at 1750 and 1430 cm−1 may have indicated carbonate ion formation.