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A novel preparation method for supported bimetallic alloy nanoparticles was investigated in this work. LaCo x Ni 1Àx O 3 with perovskite structure was prepared according to the citrate complexing method. MetalNi and Co could be obtained by reducing the perovskite precursors, and the characterization results from X-ray diffraction, temperature programmed reduction and transmission electron microscopy indicated that nanoparticles of Ni-Co solid solution alloy with size of around 12 nm were formed. As a lot of metal ions can enter into perovskite lattice, this method should be extended to prepare various bimetallic or polymetallic nanoparticles. The resultant catalysts of Ni-Co alloy supported on La 2 O 3 presented high activity and good stability for steam reforming of ethanol. Carbon deposition and sintering of the metal nanoparticles were investigated. After 10 hours' running at the relatively low reaction temperature of 550 C, Co-rich catalysts showed some deactivation, which was ascribed to carbon deposition. The cobalt sites in the catalysts were inclined to form amorphous carbon, while the nickel sites tended to generate filamentous carbon, and the former led to more severe deactivation. At the relatively high reaction temperature of 700 C, the bimetallic alloy catalysts presented better antisintering ability than the monometal catalysts.a Calculated from XRD results with Scherrer formula: D ¼ Kl/(b cos q); D PTO , crystal size of perovskite; D p , crystal size of metallic phase of the samples reduced at 650 C. b Crystal size of metallic phase of samples reacted at 700 C for 30 h. This journal is

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