Comparative studies on the characteristic properties of the ground and conventional LaCo0.7Cu0.3O3 perovskite

Abstract

The characteristics of two perovkites and a blend of mixed oxides prepared by reactive grinding and citrate complex method have been comparatively investigated using several techniques (X-ray, BET, H₂-TPR, chemisorption, O₂-TPD). XRD results confirm the successful substitution of Co by Cu in the lattice of La(Co,Cu)O₃ perovkite. The ground materials with smaller particle sizes and larger surface area show more thermal stability than does the citrate-derived sample under the same reducing conditions. Due to a lower surface area and nonporous structure, the conventional sample adsorbed a smaller amount of oxygen on the surface sites and on the vacancies compared with the other catalysts.