▎ 摘　　要

In this work we prepared Cobalt-Lanthanum oxide supported on reduced graphene oxide (rGO) for the water-gas shift reaction (WGSR). The reduced graphene oxide support was synthesized and then impregnated with cobalt (15% wt.) and lanthanum (10% wt.) nanoparticles using the precipitation-deposition method. The textural and morphologic characterization techniques confirmed that both catalysts presented small and high-dispersed nanoparticles and high surface area. The support structure was also preserved, according to XRD and Raman analyses. XPS results showed that La promotion increased the concentration of Co2+ species, and the reducibility. CO conversions and H-2 yields were close to thermodynamic equilibrium values above 400 degrees C. The WGS catalytic test results ratified that the La promoter improved significantly the H-2 yield above 275 degrees C and inhibited methane formation at low temperatures. Results show that La2O3 react with H2O and subsequently with CO2 increasing H-2 formation.