Urea‐Based Combustion Process for the Synthesis of Nanocrystalline Ni‐La‐Fe‐O Catalysts

Nanocrystalline Ni‐La‐Fe‐O catalysts having the general formula NiLa x Fe 2− x O 4 (0.00 ≤ x ≤ 2.00) were synthesized by the combustion route employing urea as a combustion fuel. The calcination process was affected at 500°C. The structural properties of the obtained catalysts were systematically investigated by X‐ray powder diffraction (XRD), scanning electronic microscopy (SEM), energy‐dispersive X‐ray spectra (EDX), and nitrogen adsorption at −196°C. Crystalline NiFe 2 O 4 and La 2 NiO 4 phases were detected for the catalysts having x = 0.00 and 2.00, respectively, as a result of solid‐solid interaction between mixtures precursors. The activity of the obtained catalysts was checked for hydrogen peroxide decomposition at 35–55°C. A synergic effect was observed for the catalysts having x ‐value of 1.00 and 1.50. Such effect was attributed to the increase in the number of the active constituents involved in the catalytic decomposition of H 2 O 2 .