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The insertion of copper into the gold lattice forming gold− copper (AuCu) nanoalloys enhances the gold catalytic performance in reactions such as CO oxidation. Here, we compared the catalytic performance of 6 nm AuCu nanoparticles (NPs) supported on SiO 2 (AuCu_SiO 2 ), a nonreducible oxide, and CeO 2 (AuCu_CeO 2 ), a reducible one, under preferential oxidation of CO (CO-PROX). Under reaction conditions, the support nature impacted on the stabilization of different species on the catalyst surface. The AuCu_CeO 2 was both more active and more stable, which was associated with the ability of CeO 2 to stabilize the AuCu alloy phase under reaction conditions.

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