The design of active and stable oxidation catalysts for low-temperature CO Oxidation is essential to meet the increasingly-stringent emission control standard.  In contrast to the traditional approach based on metal/metal oxide support, we explore surface oxygenation of multicomponent nanoalloys for the design of oxidation catalysts with enhanced activity and stability.  This report describes new findings of surface-oxygenated Pt-3d transition metal nanoalloys for low-temperature oxidation of carbon monoxide.  The ternary nanoalloys are derived by alloying low-level Pt with non-noble lower 3d transition metals in nanoparticles, and followed by thermochemical oxygenation-deoxygenation treatments.  The degree of surface oxygenation is shown to play an important role in producing active lattice oxygen on the nanoalloy’s surface/subsurface layers, leading to enhanced catalytic activities for CO oxidation. New insights into the role of oxygenation in the catalytic performance of the nanoalloys by harnessing the oxophilic propensity of 3d transition metals alloyed with Pt in the catalysts are discussed.

Low-temperature CO oxidation over surface-oxygenated nanoalloy catalysts

ACS Fall 2021

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