We have recently shown that mono-disperse single Pt atoms on ?-Al2O3, an inert substrate, are catalytically active for CO oxidation. We also presented the results of first principle studies of the CO oxidation on Pt/?-alumina and described energetically favored pathways that do not involve the substrate in the CO oxidation process. Our proposed pathway involves intermediates that have been observed in the reaction of CO and O2 with (Ph3P)2Pt.  Literature reports show that NO oxidation on Pt is dependent on particles size and become less efficient as the particles size decreases due to increased oxide component of Pt particles. Now, we have found that NO oxidation does occur on single supported Pt atoms which are fully oxidized. We will present our first principle modeling results and experimental data on NO oxidation on single Pt and Pd atoms. One of the important results comes from first principles modeling which shows that mono-dentate nitrate is an intermediate in NO oxidation and its formation is endothermic for NO oxidation on Pt but exothermic on Pd. The elimination of NO2 from the nitrate is an endothermic process for both single supported Pt and Pd.

Catalysis on single Pt group atoms supported on inert substrates

248th National Meeting (2014)

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