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In this study the LED method was applied for the fabrication of “core-shell” Pd and Pt catalysts based on size-selected nanoparticles. For these catalysts a high degree of surface coverage (3.5-0.5 ML) is achieved even at low (10-2-10-3 wt.%) percent of metal loading. The catalysts on different supports (ZSM-5, Al2O3, HOPG and Sibunit) were characterized by TEM, XPS and DRIFT spectroscopy. Their efficiency was compared with traditional supported catalysts in the CO oxidation.