To design active, robust, and low-cost alloy catalysts for many practical chemical reactions, including green energy production, storage and conversion devices, various studies have focused on increasing the activity and stability while reducing the amount of Pt in the catalyst. In addition to bimetallic alloys, e.g., Pt alloyed with Co or Ni, attention has shifted to trimetallic alloy catalysts reflecting increasing evidence that they can deliver even better performance in activity and stability with a lower Pt content in the catalysts, which are sometimes attributed to lattice strain in terms of the lattice, parameter of the catalyst's face centered cubic type structure. Certain supported nanoalloys have also found application in important chemical reactions such as preferential oxidation (PROX) of carbon monoxide in water gas shift (WGS) reaction for hydrogen production. The understanding of the effect of support on the structural and catalytic properties of nanoalloy catalysts is important for design of catalysts for many reactions, especially for the selective reaction like PROX reaction. In this report, recent results of our investigations of how the controlled structural and chemical ordering tune the surface catalytic sites on an example ternary nanoalloy catalyst, PtNiCo, for carbon monooxide oxidation reaction are discussed.
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