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Well reduced silica-supported rhodium catalysts contain oxygen species that are able to participate in reactions. Adsorbed CO molecules were demonstrated to exchange their oxygen atoms with oxygen atoms from these catalysts. The amount of such reactive oxygen is increased by a vanadium promoter. Using infrared adsorption, the scrambling of13C18O to13C16O was studied as a function of the temperature. The vanadium promoter decreases the temperature for CO scrambling. Linear adsorbed CO is the preferred initial state for this process.

CO scrambling with reactive oxygen species on vanadium promoted rhodium catalysts