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The barrier to CO oxidation on Pt catalysts is the strongly bound adsorbed CO, which inhibits O 2 adsorption and hinders CO 2 formation. Using reaction studies and in situ X-ray spectroscopy with colloidally prepared, monodisperse ∼2nm Pt and PtSn nanoparticle catalysts, we show that the addition of Sn to Pt provides distinctly different reaction sites and a more efficient reaction...
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