Correlations between synthetic conditions and catalytic activity of LaMO3 perovskite-like oxide materials (M: Fe, Co, Ni): The key role of glycine

Herein N₂O decomposition over LaMO₃ (M: Fe, Co, Ni) mixed oxides with perovskite structures has been optimized. The influence of the organic additive and the additive to (La³⁺ + Co²⁺) molar ratio on phase composition, particle aggregate size, textural properties, and catalytic activity of LaCoO₃ has been determined for the first time. Glycine improved the phase purity of LaCoO₃, enhanced the specific surface area and pore volume, and shifted the pore size distribution to the wider mesopore and macropore regions. LaCoO₃ showed better activity than LaFeO₃ and LaNiO₃ owing to the greater reducibility of Co³⁺ and its large specific surface area, and correlations between the La³⁺:Co²⁺ molar ratio, particle aggregate size, pore volume for pores larger than 25 nm, and N₂O decomposition activity for LaCoO₃ have been determined. Changes in the LaCoO₃ textural properties following catalytic experiments with 10% water vapor added to the feed have also been analyzed here-in.