Diesel fuel reforming over catalysts derived from LaCo1−xRuxO3 perovskites with high Ru loading

Catalysts derived from LaCo1−xRuxO3 perovskite precursors with high Ru loading (x = 0.2 and 0.4) were studied in the oxidative reforming of diesel for hydrogen production. High partial substitution of Co by Ru in LaCoO3 perovskite modifies its physicochemical characteristics. It was observed that the high degree of Co substitution in the perovskite changes the rhombohedral crystalline perovskite particles to particles with orthorhombic structure, lower size and higher specific surface area. These modifications affected the structure and morphology of the catalysts derived from the reduction of the perovskite precursors. Catalysts derived from LaCo1−xRuxO3 perovskite precursors with high Ru loading shown particles of La2O3 and Co0 with small particle size and high surface concentration of Ru0 particles. The modifications in the structural characteristics of the catalysts induced by the addition of Ru in the LaCo1−xRuxO3 perovskite precursor had influence on their catalytic behaviour in the oxidative reforming of diesel. The catalyst derived from the perovskite with higher degree of Co substitution (x = 0.4) showed the higher activity and stability for the production of hydrogen for long periods of time-on-stream. The greater Ru exposition achieved in this catalyst was responsible of the increase in the stability observed in this sample taking into account the lower tendency to form carbonaceous deposits of the Ru particles formed.

► Substitution of Co by Ru in LaCoO3 modifies its physicochemical characteristics. ► Incorporation of Ru in LaCoO3 modifies the size of Co and La in catalysts. ► Higher degree of Ru substitution in LaCoO3 implies better activity and stability.