Abstract
Gold catalysts remain of great interest, but a high gold price presents a concern. Gold can be leached from gold–titania catalysts using alkaline cyanide solutions. The specific activity of gold for CO oxidation can thereby be increased substantially, though the precise nature of the gold before and after treatment remains unclear. It seems unlikely that leaching proceeds in a simple manner by selective dissolution of metallic gold particles. Rather it is likely that cyanide ions interact with gold centers in several ways and, in addition, alkali metal ions may also modify activity.
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