Tailored Pt nanoparticles were prepared in strong alkaline ethylene glycol solution and deposited on alpha-Al2O3, gamma-Al2O3, and CeO2-TiO2. The resulting supported catalytic materials were applied for ammonia oxidation between 473 and 1073 K in the temporal analysis of products reactor. Although the catalysts possessed only 0.005 wt.% Pt, they were active and selective for nitric oxide formation. The NO selectivity obtained over Pt/CeO2-TiO2 between 873 and 1073 K was around 98% and exceeded that of industrially relevant Pt wire. Both alumina-supported catalysts were less selective. Pt/CeO2-TiO2 also showed the highest NO selectivity in steady-state ambient pressure tests. The superior performance of Pt/CeO2-TiO2 is related to a synergy effect between the noble metal and the support since they provide adsorbed and lattice oxygen species for selective NH3 oxidation to NO in a complementary fashion. (C) 2013 Elsevier Inc. All rights reserved.