Smoking articles including gold catalyst

摘要

A smoking article such as a cigarette, or a smoke filter or other component thereof, comprises a catalyst for the oxidation of carbon monoxide to carbon dioxide. The catalyst comprises gold, and an oxide of zinc or titanium. Titania and mixed oxides of zinc and copper or aluminum are preferred (TiO2, ZnO, ZnAlOx or CuZnOx). The gold preferably comprises species in the metallic state)(Au0), together with species in an oxidized state (Auδ+).