Oxidative steam reforming of ethanol (OESR) was investigated over Pt-Ni/CeO2-SiO2 catalysts prepared from different cerium salt precursors. During stability tests performed at 500 degrees C, steam/ethanol ratio (S/E) of 4 and oxygen/ethanol ratio of 0.5 (O/E), the highest performance was recorded over the catalyst prepared form organic precursors. The most promising formulation was tested at different temperatures, S/E and O/E. Complete conversion was recorded during 100 h of the test at 600 degrees C, with a very low carbon formation rate (6.9.10(-7) g(coke), (oxidized). g(Caalyst).(-1) g(carbon,fed)(-1) . h(-1)). The increase of oxygen content in the reacting mixture from 5 to 7.5% had a beneficial effect on H-2 yield, which rose of more than 20% after 100 h of test, and on the conversion of by-products. When steam/ethanol ratio grew from 4 to 6, a slightly lower performance improvement was observed. Therefore, the highest activity and stability during OESR over the Pt-Ni/CeO2-SiO2 catalyst prepared from organic salts was achieved at 600 degrees C, O/E = 0.75 and S/E = 6. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.