Nanocrystalline Ag, and Au-Ag alloys supported on titania for CO oxidation reaction

► Au-Ag catalysts catalyze the CO oxidation at low temperatures with long-term stability and durability. ► Gold and silver atoms formed alloys that interacted strongly with the support and were stable in air at RT. ► The most active Au-Ag catalysts were those prepared by sequential deposition and activated in hydrogen.