The understanding of the detailed structures in nanoalloy catalysts have is important for many chemical reactions such as preferential oxidation (PROX) of carbon monoxide in water gas shift (WGS) reaction for hydrogen production.  This report describes recent results of an investigation of how the controlled thermal annealing tunes the alloy structure and catalytic sites using an example ternary nanoalloy, PtNiCo nanoparticles supported on different supports.  The catalytic activity for CO oxidation reaction was examined.  Synchrotron x-ray based techniques such as high-energy x-ray diffraction (HE-XRD) coupled to atomic pair distribution function (PDF) analysis and X-ray absorption fine structure spectroscopy (XAFS) have been used to determine the structural/chemical ordering and the metal coordination structures.  The atomic-scale ordering and coordination structures have been revealed to significantly influence the catalytic activity.  Implications of the results to the understanding of different active sites on the nanoalloy surface will also be discussed.

Platinum-containing ternary nanoalloy catalysts for CO oxidation

244th National Meeting (2012)

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