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Catalysts H 2000Catalytic Properties of Nanostructured Pt and Ru Metal Clusters over Alumina Promoted by CeO 2 . -0.5%Pt-0.5%Ru/2%Ce/(θ+α)-Al 2 O 3 , reduced in H 2 at 1173 K, partially oxidizes CH4 into synthesis-gas at short contact times with high conversion of methane and selectivity for CO and H2 close to 100% due to the presence of nanoparticles of Pt and Ru. Methane is activated on Pt and Ru metal clusters while oxygen is activated on the Ce oxide nanostructures. Increasing the contact time reduces slightly the conversion of CH 4 to 82% and selectivity by CO and H 2 . The ratio H 2 /CO is close to 2. Such a ratio is ideal for synthesis of methanol and hydrocarbons. -(DOSSUMOV*, K.; SALAKHOVA, R. K.; POPOVA, N. M.; TUNGATAROVA, S. A.; GRIGORIEVA, V. P.; KOMASHKO, L. V.; SASS, A. S.; J. Alloys Compd.